47:"/_next/static/chunks/2g8w-80ml0qgh.js" 48:"/_next/static/chunks/0iv56yrji_20j.js" 49:"/_next/static/chunks/2j22cxchii_xx.js" 4a:"/_next/static/chunks/0lc44eilyyvky.js" 4b:"/_next/static/chunks/1jl6tco-uuy-j.js" 4c:"/_next/static/chunks/1ot1rbfa0d_n4.js" 4d:"/_next/static/chunks/3i1_gmjy-npy3.js" 4e:"/_next/static/chunks/3k2gyg36fnag_.js" 4f:"/_next/static/chunks/0om3fkgfnicab.js" 50:"/_next/static/chunks/39xqakak-rww8.js" 51:"/_next/static/chunks/2k8pepwc4pxns.js" 52:"/_next/static/chunks/3di53f0fz7pw_.js" 53:"/_next/static/chunks/0wa9m1-tphf9u.js" 54:"/_next/static/chunks/2d693k1du0jif.js" 55:"/_next/static/chunks/0te7j7aao-pe9.js" 56:"/_next/static/chunks/23lvo0719esx5.js" 57:"/_next/static/chunks/2s3axvrz9s11v.js" 58:"/_next/static/chunks/3m1xjj5kw5fie.js" 59:"/_next/static/chunks/20k3408cq3fwt.js" 5a:"/_next/static/chunks/3bgoyiso1rhn7.js" 5b:"/_next/static/chunks/1r-4-7k4p367v.js" 5c:"/_next/static/chunks/0oag6lffx7d01.js" 5d:"/_next/static/chunks/082jo-0ajazgr.js" 5e:"/_next/static/chunks/0-a64pg0hn7g7.js" 5f:"/_next/static/chunks/09nq57stwzkgf.js" 60:"/_next/static/chunks/20329i6m_04t6.js" 61:"/_next/static/chunks/0i3-eynrkvqi7.js" 62:"/_next/static/chunks/0so1i35v7xcta.js" 63:"/_next/static/chunks/1nyz-fz1mk3y6.js" 64:"/_next/static/chunks/1aoncsc85dt-5.js" 65:"/_next/static/chunks/2ozcrjb_hh74t.js" 66:"/_next/static/chunks/0hy4a31wjpabs.js" 67:"/_next/static/chunks/1tn-0fivsxsv1.js" 68:"/_next/static/chunks/0hlb44ca7-4a2.js" 69:"/_next/static/chunks/3ah32gv3pv1wi.js" 6a:"/_next/static/chunks/0jbzid2v9xv3h.js" 6b:"/_next/static/chunks/2wl4_vih_-70f.js" 6c:"/_next/static/chunks/1_lo_qve3gu86.js" 6d:"/_next/static/chunks/30zlk96upymcb.js" 6e:"/_next/static/chunks/18ggtgz2yf759.js" 6f:"/_next/static/chunks/3odmutpycmfnf.js" 70:"/_next/static/chunks/253gnmj0-cj17.js" 71:I[593304,["$2d","$2e","$2f","$30","$31","$32","$47","$48","$49","$4a","$4b","$4c","$4d","$4e","$4f","$50","$51","$52","$53","$54","$55","$56","$57","$58","$59","$5a","$5b","$5c","$5d","$5e","$5f","$60","$61","$62","$63","$64","$65","$66","$67","$68","$69","$6a","$6b","$6c","$6d","$6e","$6f","$70"],"OwnedHydration"] 72:T4b4,### Properties of OLS Residuals Under ordinary least squares (OLS) estimation, residuals possess important mathematical properties that arise directly from the normal equations. For a model $y = X\beta + \varepsilon$, the OLS residual vector is: $$\mathbf{e} = \mathbf{y} - \hat{\mathbf{y}} = \mathbf{y} - X\hat{\beta} = (I - H)\mathbf{y}$$ where $H = X(X^TX)^{-1}X^T$ is the **hat matrix** (also called the projection matrix). Several key properties follow: **Property 1: Zero Sum** $$\sum_{i=1}^{n} e_i = 0$$ *Proof:* The first normal equation states $X^T e = 0$. If the model includes an intercept, the first column of $X$ is $\mathbf{1}$ (all ones), so $\mathbf{1}^T e = \sum e_i = 0$. **Property 2: Orthogonality to Predictors** $$X^T \mathbf{e} = 0$$ *Meaning:* Residuals are uncorrelated with each predictor column. This is exactly the condition that defines OLS—minimizing squared residuals yields predictions orthogonal to the residual space. **Property 3: Orthogonality to Fitted Values** $$\hat{\mathbf{y}}^T \mathbf{e} = 0$$ *Meaning:* Residuals are uncorrelated with fitted values—a consequence of the previous property since $\hat{y}$ is a linear combination of predictor columns.73:T4a5,Not all residuals are created equal. For diagnostic purposes, we often transform raw residuals to account for the non-constant variance inherent in OLS residual structure. Understanding these transformations is critical for proper interpretation. ### Raw Residuals The simplest form, raw residuals are just the observed minus predicted: $$e_i = y_i - \hat{y}_i$$ **Limitation:** Raw residuals have unequal variances. Specifically, $\text{Var}(e_i) = \sigma^2(1 - h_{ii})$ where $h_{ii}$ is the $i$-th diagonal element of the hat matrix. Points with high leverage (large $h_{ii}$) have artificially smaller residuals, making comparison across observations misleading. ### Standardized Residuals To enable comparison, we standardize by the estimated standard deviation: $$r_i = \frac{e_i}{\hat{\sigma}}$$ where $\hat{\sigma} = \sqrt{\frac{1}{n-p}\sum_{i=1}^{n}e_i^2}$ is the residual standard error (RSS divided by degrees of freedom). This gives residuals on a consistent scale—approximately unit variance under the model assumptions. **Limitation:** This still doesn't account for the fact that different observations have different residual variances due to leverage differences.74:T4c9,### Internally Studentized Residuals To properly account for leverage, we divide by the estimated standard deviation of each residual: $$r_i^{\text{int}} = \frac{e_i}{\hat{\sigma}\sqrt{1-h_{ii}}}$$ These are sometimes called **standardized residuals** in software (causing confusion with our earlier definition). Under normal errors, internally studentized residuals approximately follow a standard normal distribution. ### Externally Studentized Residuals (Studentized Deleted Residuals) The most sophisticated form uses a **leave-one-out** approach. For each observation $i$, we compute: $$t_i = \frac{e_i}{\hat{\sigma}_{(i)}\sqrt{1-h_{ii}}}$$ where $\hat{\sigma}_{(i)}$ is the residual standard error computed from a model fitted **without observation $i$**. This removes the self-influence problem—the residual is being standardized by variance estimated from independent data. **Computational efficiency:** Remarkably, we don't need to refit $n$ separate models. The externally studentized residual can be computed as: $$t_i = r_i^{\text{int}} \sqrt{\frac{n-p-1}{n-p-(r_i^{\text{int}})^2}}$$ Under normal errors, $t_i$ follows a $t$-distribution with $n-p-1$ degrees of freedom, enabling formal outlier testing.75:T92a,import numpy as np from scipy import stats def compute_residual_types(X, y, include_intercept=True): """ Compute all four types of residuals for regression diagnostics. Parameters: ----------- X : ndarray of shape (n, p) Design matrix (without intercept column if include_intercept=True) y : ndarray of shape (n,) Response vector include_intercept : bool Whether to add intercept column to X Returns: -------- dict with keys: 'raw', 'standardized', 'internally_studentized', 'externally_studentized', 'leverage', 'sigma_hat' """ n = len(y) # Add intercept if needed if include_intercept: X = np.column_stack([np.ones(n), X]) p = X.shape[1] # Number of parameters including intercept # Compute OLS estimates XtX_inv = np.linalg.inv(X.T @ X) beta_hat = XtX_inv @ X.T @ y y_hat = X @ beta_hat # Raw residuals e = y - y_hat # Hat matrix diagonal (leverage values) H = X @ XtX_inv @ X.T h = np.diag(H) # Residual standard error RSS = np.sum(e**2) sigma_hat = np.sqrt(RSS / (n - p)) # Standardized residuals r_std = e / sigma_hat # Internally studentized residuals r_int = e / (sigma_hat * np.sqrt(1 - h)) # Externally studentized residuals (efficient formula) r_ext = r_int * np.sqrt((n - p - 1) / (n - p - r_int**2)) return { 'raw': e, 'standardized': r_std, 'internally_studentized': r_int, 'externally_studentized': r_ext, 'leverage': h, 'sigma_hat': sigma_hat, 'n': n, 'p': p } # Example usage with synthetic data np.random.seed(42) n = 100 X = np.random.randn(n, 2) true_beta = np.array([2, -1, 0.5]) # intercept, beta1, beta2 y = true_beta[0] + X @ true_beta[1:] + np.random.randn(n) * 0.5 # Add an outlier y[0] = y[0] + 5 results = compute_residual_types(X, y) print(f"Observation 1 (outlier) residuals:") print(f" Raw: {results['raw'][0]:.4f}") print(f" Standardized: {results['standardized'][0]:.4f}") print(f" Internally Studentized: {results['internally_studentized'][0]:.4f}") print(f" Externally Studentized: {results['externally_studentized'][0]:.4f}") print(f" Leverage (h_11): {results['leverage'][0]:.4f}")76:T55a,### Pattern Recognition: What Each Shape Tells You **Pattern 1: Curvature (U-shape or inverted U)** *Diagnosis:* The relationship between predictors and response is nonlinear. A linear model is missing quadratic or higher-order terms. *Example:* Fitting a linear model to $y = \beta_0 + \beta_1 x + \beta_2 x^2 + \varepsilon$ without the $x^2$ term produces residuals that are negative for extreme $\hat{y}$ values and positive in the middle (or vice versa). *Remedy:* Add polynomial terms, apply transformations (log, sqrt), or consider nonlinear models. **Pattern 2: Funnel Shape (Heteroscedasticity)** *Diagnosis:* Residual variance increases (or decreases) with fitted values. The constant variance assumption is violated. *Example:* In income prediction, high-income individuals show more variability than low-income individuals. Residuals fan out as $\hat{y}$ increases. *Remedy:* Log-transform the response, use weighted least squares, or fit a model that accounts for heteroscedasticity (e.g., generalized least squares). **Pattern 3: Horizontal Band with Isolated Points** *Diagnosis:* General structure is acceptable but individual outliers exist. These may be data errors, special cases, or genuine unusual observations. *Remedy:* Investigate outliers individually. Consider robust regression if outliers are genuine but shouldn't dominate the fit.77:T1165,import numpy as np import matplotlib.pyplot as plt from scipy import stats def create_diagnostic_plots(y, y_hat, residuals, leverage=None, figsize=(14, 10)): """ Create a comprehensive 2x2 grid of regression diagnostic plots. Parameters: ----------- y : array-like Observed response values y_hat : array-like Fitted/predicted values residuals : dict Dictionary with residual types from compute_residual_types() leverage : array-like, optional Leverage values (h_ii) """ fig, axes = plt.subplots(2, 2, figsize=figsize) # Plot 1: Residuals vs Fitted ax1 = axes[0, 0] ax1.scatter(y_hat, residuals['raw'], alpha=0.6, edgecolors='k', linewidth=0.5) ax1.axhline(y=0, color='red', linestyle='--', linewidth=2) ax1.set_xlabel('Fitted Values', fontsize=12) ax1.set_ylabel('Residuals', fontsize=12) ax1.set_title('Residuals vs Fitted', fontsize=14, fontweight='bold') # Add LOWESS smoother for pattern detection from statsmodels.nonparametric.smoothers_lowess import lowess smoothed = lowess(residuals['raw'], y_hat, frac=0.5) ax1.plot(smoothed[:, 0], smoothed[:, 1], color='blue', linewidth=2, label='LOWESS smoother') ax1.legend() # Plot 2: Q-Q Plot ax2 = axes[0, 1] stats.probplot(residuals['internally_studentized'], dist="norm", plot=ax2) ax2.set_title('Normal Q-Q', fontsize=14, fontweight='bold') ax2.get_lines()[0].set_markersize(5) ax2.get_lines()[0].set_alpha(0.6) # Plot 3: Scale-Location Plot ax3 = axes[1, 0] sqrt_abs_std_resid = np.sqrt(np.abs(residuals['internally_studentized'])) ax3.scatter(y_hat, sqrt_abs_std_resid, alpha=0.6, edgecolors='k', linewidth=0.5) ax3.set_xlabel('Fitted Values', fontsize=12) ax3.set_ylabel('√|Standardized Residuals|', fontsize=12) ax3.set_title('Scale-Location', fontsize=14, fontweight='bold') smoothed = lowess(sqrt_abs_std_resid, y_hat, frac=0.5) ax3.plot(smoothed[:, 0], smoothed[:, 1], color='red', linewidth=2) # Plot 4: Residuals vs Leverage if leverage is not None: ax4 = axes[1, 1] ax4.scatter(leverage, residuals['internally_studentized'], alpha=0.6, edgecolors='k', linewidth=0.5) ax4.axhline(y=0, color='gray', linestyle='--') ax4.set_xlabel('Leverage (h_ii)', fontsize=12) ax4.set_ylabel('Standardized Residuals', fontsize=12) ax4.set_title('Residuals vs Leverage', fontsize=14, fontweight='bold') # Add Cook's distance contours n = len(y) p = len(y) - len(residuals['raw']) + residuals['p'] # Approximate for cook_d in [0.5, 1.0]: h_range = np.linspace(0.001, max(leverage) * 1.1, 100) y_cook = np.sqrt(cook_d * p * (1 - h_range) / h_range) ax4.plot(h_range, y_cook, 'r--', alpha=0.4) ax4.plot(h_range, -y_cook, 'r--', alpha=0.4) plt.tight_layout() return fig # Demonstrate with examples showing different patterns fig, axes = plt.subplots(1, 3, figsize=(15, 4)) # Example 1: Good residual pattern np.random.seed(42) n = 100 x = np.random.randn(n) y_good = 2 + 3*x + np.random.randn(n) y_hat_good = 2 + 3*x e_good = y_good - y_hat_good axes[0].scatter(y_hat_good, e_good, alpha=0.6) axes[0].axhline(0, color='red', linestyle='--') axes[0].set_xlabel('Fitted Values') axes[0].set_ylabel('Residuals') axes[0].set_title('Good Pattern (Random Scatter)', fontweight='bold') # Example 2: Nonlinearity (quadratic term missing) y_quad = 2 + 3*x + 2*x**2 + np.random.randn(n) y_hat_linear = 2 + 3*x # Wrong model (missing x²) e_nonlin = y_quad - y_hat_linear axes[1].scatter(y_hat_linear, e_nonlin, alpha=0.6) axes[1].axhline(0, color='red', linestyle='--') axes[1].set_xlabel('Fitted Values') axes[1].set_ylabel('Residuals') axes[1].set_title('Nonlinearity (U-shaped Pattern)', fontweight='bold') # Example 3: Heteroscedasticity (funnel) y_hetero = 2 + 3*x + np.random.randn(n) * (1 + 2*np.abs(x)) y_hat_hetero = 2 + 3*x e_hetero = y_hetero - y_hat_hetero axes[2].scatter(y_hat_hetero, e_hetero, alpha=0.6) axes[2].axhline(0, color='red', linestyle='--') axes[2].set_xlabel('Fitted Values') axes[2].set_ylabel('Residuals') axes[2].set_title('Heteroscedasticity (Funnel Shape)', fontweight='bold') plt.tight_layout() plt.savefig('residual_patterns.png', dpi=150, bbox_inches='tight') plt.show()78:T524,While residual vs. fitted plots reveal overall model issues, **partial residual plots** (also called component-plus-residual plots) let us examine the functional form of individual predictors. This is crucial for detecting nonlinear relationships in specific variables. ### Construction For predictor $x_j$, the partial residual is: $$e_i^{(j)} = e_i + \hat{\beta}_j x_{ij}$$ We then plot $e_i^{(j)}$ against $x_{ij}$. The resulting scatter should approximate the partial relationship between $y$ and $x_j$ while controlling for other predictors. ### Interpretation If the true relationship between $y$ and $x_j$ is linear, the partial residual plot will show a linear pattern with slope approximately $\hat{\beta}_j$. Curvature in the plot suggests the linear term is inadequate—we might need polynomial terms, splines, or transformations. ### Why This Works Consider the true model: $E[y|x] = \alpha + \beta_j x_j + g(x_{-j})$ where $g(x_{-j})$ captures all other predictor effects. The OLS residual is approximately: $$e \approx \varepsilon + (\text{nonlinearity in } x_j)$$ Adding back $\hat{\beta}_j x_j$ recovers the total contribution of $x_j$: $$e + \hat{\beta}_j x_j \approx \beta_j x_j + (\text{nonlinearity in } x_j) + \varepsilon$$ Plotting this against $x_j$ reveals the true functional form.79:Ta7c,import numpy as np import matplotlib.pyplot as plt from sklearn.linear_model import LinearRegression from statsmodels.nonparametric.smoothers_lowess import lowess def partial_residual_plots(X, y, feature_names=None, figsize=(14, 5)): """ Create partial residual (component-plus-residual) plots for each predictor. Parameters: ----------- X : ndarray of shape (n, p) Design matrix of predictors y : ndarray of shape (n,) Response variable feature_names : list of str, optional Names for each predictor column """ n, p = X.shape if feature_names is None: feature_names = [f'X{i+1}' for i in range(p)] # Fit the model model = LinearRegression() model.fit(X, y) y_hat = model.predict(X) residuals = y - y_hat betas = model.coef_ # Create subplot grid fig, axes = plt.subplots(1, p, figsize=figsize) if p == 1: axes = [axes] for j, (ax, name, beta) in enumerate(zip(axes, feature_names, betas)): # Compute partial residuals partial_resid = residuals + beta * X[:, j] # Plot ax.scatter(X[:, j], partial_resid, alpha=0.6, edgecolors='k', linewidth=0.5) # Add the fitted component line (slope = beta) x_range = np.linspace(X[:, j].min(), X[:, j].max(), 100) ax.plot(x_range, beta * x_range, 'r-', linewidth=2, label=f'Linear fit (β={beta:.3f})') # Add LOWESS smoother to detect nonlinearity smoothed = lowess(partial_resid, X[:, j], frac=0.5) ax.plot(smoothed[:, 0], smoothed[:, 1], 'b--', linewidth=2, label='LOWESS smoother') ax.set_xlabel(name, fontsize=12) ax.set_ylabel(f'e + β_{name}·{name}', fontsize=10) ax.set_title(f'Partial Residual: {name}', fontweight='bold') ax.legend(fontsize=8) plt.tight_layout() return fig # Demonstration: detecting need for quadratic term np.random.seed(42) n = 200 # X1 has a linear effect, X2 has a quadratic effect (which we'll miss initially) X1 = np.random.uniform(-3, 3, n) X2 = np.random.uniform(-3, 3, n) y = 2 + 3*X1 + 1.5*X2 + 0.8*X2**2 + np.random.randn(n) X = np.column_stack([X1, X2]) # Create partial residual plots fig = partial_residual_plots(X, y, feature_names=['X1 (linear)', 'X2 (quadratic ignored)']) plt.suptitle('Partial Residual Plots Reveal Missing Quadratic Term in X2', fontsize=14, fontweight='bold', y=1.02) plt.savefig('partial_residual_demo.png', dpi=150, bbox_inches='tight') plt.show() # The plot for X2 will show clear curvature, indicating we need X2² term7a:T542,**Added variable plots** (AVPs), also called partial regression plots, serve a different purpose from partial residual plots. They visualize the unique contribution of a predictor *after controlling for other predictors*, revealing the marginal relationship between $x_j$ and $y$. ### Construction For predictor $x_j$: 1. Regress $y$ on all predictors **except** $x_j$. Save residuals: $\tilde{y}_i$ 2. Regress $x_j$ on all other predictors. Save residuals: $\tilde{x}_{j,i}$ 3. Plot $\tilde{y}_i$ versus $\tilde{x}_{j,i}$ The slope of the regression line through this scatter equals $\hat{\beta}_j$ from the full model (Frisch-Waugh-Lovell theorem). ### Why This Matters AVPs show the **marginal relationship** between $x_j$ and $y$—what $x_j$ explains that no other predictor can. This is crucial because: - High correlation among predictors can obscure individual effects - A predictor might correlate with $y$ only because it correlates with another predictor - The AVP separates true predictive power from confounding ### Interpretation - **Strong positive/negative slope**: $x_j$ has significant marginal effect - **Flat scatter**: $x_j$ adds little after controlling for others - **Curvature**: Nonlinear marginal effect (rare but informative) - **Isolated points far from origin**: High leverage observations for this predictor7b:Tbec,import numpy as np import matplotlib.pyplot as plt from sklearn.linear_model import LinearRegression def added_variable_plots(X, y, feature_names=None, figsize=(14, 5)): """ Create added variable (partial regression) plots. For each predictor x_j: 1. Regress y on all X except x_j -> residuals = y_tilde 2. Regress x_j on all X except x_j -> residuals = x_tilde 3. Plot y_tilde vs x_tilde The slope of this plot equals the coefficient β_j from full model. """ n, p = X.shape if feature_names is None: feature_names = [f'X{i+1}' for i in range(p)] # Fit full model to get coefficients for comparison full_model = LinearRegression() full_model.fit(X, y) full_betas = full_model.coef_ # Create subplot grid fig, axes = plt.subplots(1, p, figsize=figsize) if p == 1: axes = [axes] for j, (ax, name, full_beta) in enumerate(zip(axes, feature_names, full_betas)): # Get indices of other predictors other_idx = [i for i in range(p) if i != j] X_other = X[:, other_idx] # Regress y on other predictors model_y = LinearRegression() model_y.fit(X_other, y) y_tilde = y - model_y.predict(X_other) # Regress x_j on other predictors model_x = LinearRegression() model_x.fit(X_other, X[:, j]) x_tilde = X[:, j] - model_x.predict(X_other) # Plot the added variable plot ax.scatter(x_tilde, y_tilde, alpha=0.6, edgecolors='k', linewidth=0.5) # Fit line through the AVP (slope should equal full_beta) avp_slope = np.cov(x_tilde, y_tilde)[0, 1] / np.var(x_tilde) x_range = np.linspace(x_tilde.min(), x_tilde.max(), 100) ax.plot(x_range, avp_slope * x_range, 'r-', linewidth=2, label=f'AVP slope: {avp_slope:.4f}') ax.axhline(0, color='gray', linestyle='--', alpha=0.5) ax.axvline(0, color='gray', linestyle='--', alpha=0.5) ax.set_xlabel(f'{name} | Others', fontsize=10) ax.set_ylabel(f'Y | Others', fontsize=10) ax.set_title(f'Added Variable: {name} (Full model β={full_beta:.4f})', fontweight='bold') ax.legend(fontsize=8) plt.tight_layout() return fig # Demonstration: multicollinearity impact np.random.seed(42) n = 200 # Create correlated predictors X1 = np.random.randn(n) X2 = 0.9 * X1 + 0.1 * np.random.randn(n) # X2 highly correlated with X1 X3 = np.random.randn(n) # X3 independent # True model: y depends on X1 and X3, not directly on X2 y = 2 + 3*X1 + 1.5*X3 + np.random.randn(n) X = np.column_stack([X1, X2, X3]) # Create added variable plots fig = added_variable_plots(X, y, feature_names=['X1', 'X2 (corr with X1)', 'X3']) plt.suptitle('Added Variable Plots: X2 Shows Weak Marginal Effect (As Expected)', fontsize=12, fontweight='bold', y=1.05) plt.savefig('added_variable_demo.png', dpi=150, bbox_inches='tight') plt.show()7c:T570,In time series or spatially ordered data, residuals may exhibit **autocorrelation**—correlation between residuals at different time points or locations. This violates the independence assumption and has serious consequences for inference. ### Why Autocorrelation Matters When residuals are autocorrelated: - Standard errors are **biased** (usually underestimated) - t-statistics and F-statistics are **inflated** - Confidence intervals are **too narrow** - P-values suggest significance where none exists This is a severe problem: your model appears to work better than it actually does. ### Detecting Autocorrelation **Visual Method: Residual Time Series Plot** Plot residuals in their natural order (time index, spatial index, etc.). Look for: - Runs of positive or negative residuals - Cyclic patterns - Persistent deviations from zero **Formal Test: Durbin-Watson Statistic** The Durbin-Watson (DW) test detects first-order autocorrelation: $$d = \frac{\sum_{t=2}^{n}(e_t - e_{t-1})^2}{\sum_{t=1}^{n}e_t^2}$$ Interpretation: - $d \approx 2$: No autocorrelation - $d < 2$: Positive autocorrelation (residuals tend to have the same sign as neighbors) - $d > 2$: Negative autocorrelation (residuals tend to alternate signs) The test has complex critical values depending on sample size and number of predictors, but a rule of thumb is: $1.5 < d < 2.5$ suggests acceptable levels.7d:Td98,import numpy as np import matplotlib.pyplot as plt from scipy import stats from statsmodels.stats.stattools import durbin_watson from statsmodels.graphics.tsaplots import plot_acf def autocorrelation_diagnostics(residuals, max_lags=20, figsize=(14, 4)): """ Comprehensive autocorrelation diagnostics for residuals. Parameters: ----------- residuals : array-like Residuals from regression (in time order) max_lags : int Maximum number of lags for ACF plot """ e = np.array(residuals) n = len(e) # Compute Durbin-Watson statistic dw = durbin_watson(e) # Compute first-order autocorrelation coefficient rho1 = np.corrcoef(e[:-1], e[1:])[0, 1] # Create diagnostic plots fig, axes = plt.subplots(1, 3, figsize=figsize) # Plot 1: Residuals over time ax1 = axes[0] ax1.plot(range(n), e, 'b-', alpha=0.7, linewidth=1) ax1.scatter(range(n), e, s=20, alpha=0.6) ax1.axhline(0, color='red', linestyle='--', linewidth=1.5) ax1.fill_between(range(n), e, 0, alpha=0.2) ax1.set_xlabel('Observation Order (Time)', fontsize=11) ax1.set_ylabel('Residual', fontsize=11) ax1.set_title('Residuals vs. Order', fontweight='bold') # Plot 2: Lag-1 scatter plot ax2 = axes[1] ax2.scatter(e[:-1], e[1:], alpha=0.6, edgecolors='k', linewidth=0.5) ax2.axhline(0, color='gray', linestyle='--', alpha=0.5) ax2.axvline(0, color='gray', linestyle='--', alpha=0.5) # Add regression line slope = rho1 x_range = np.linspace(e.min(), e.max(), 100) ax2.plot(x_range, slope * x_range, 'r-', linewidth=2, label=f'ρ₁ = {rho1:.3f}') ax2.set_xlabel('e(t-1)', fontsize=11) ax2.set_ylabel('e(t)', fontsize=11) ax2.set_title('Lag-1 Scatter Plot', fontweight='bold') ax2.legend() # Plot 3: Autocorrelation function ax3 = axes[2] plot_acf(e, ax=ax3, lags=max_lags, alpha=0.05) ax3.set_xlabel('Lag', fontsize=11) ax3.set_title('Autocorrelation Function (ACF)', fontweight='bold') plt.suptitle(f'Durbin-Watson: {dw:.3f} | First-order autocorr: {rho1:.3f}', fontsize=12, fontweight='bold', y=1.02) plt.tight_layout() return { 'durbin_watson': dw, 'rho1': rho1, 'figure': fig } # Demonstration: compare independent vs autocorrelated residuals np.random.seed(42) n = 100 t = np.arange(n) # Case 1: No autocorrelation e_independent = np.random.randn(n) # Case 2: Positive autocorrelation (AR(1) process) rho = 0.8 e_positive = np.zeros(n) e_positive[0] = np.random.randn() for i in range(1, n): e_positive[i] = rho * e_positive[i-1] + np.sqrt(1-rho**2) * np.random.randn() # Case 3: Negative autocorrelation e_negative = np.zeros(n) e_negative[0] = np.random.randn() for i in range(1, n): e_negative[i] = -0.6 * e_negative[i-1] + np.sqrt(1-0.36) * np.random.randn() # Run diagnostics on each print("=== Independent Residuals ===") results_ind = autocorrelation_diagnostics(e_independent) print(f"D-W: {results_ind['durbin_watson']:.3f}, ρ₁: {results_ind['rho1']:.3f}") plt.savefig('autocorr_independent.png', dpi=150, bbox_inches='tight') plt.show() print(" === Positive Autocorrelation ===") results_pos = autocorrelation_diagnostics(e_positive) print(f"D-W: {results_pos['durbin_watson']:.3f}, ρ₁: {results_pos['rho1']:.3f}") plt.savefig('autocorr_positive.png', dpi=150, bbox_inches='tight') 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Learning","topic":"Linear Regression Deep Dive","title":"Regression Diagnostics","description":"Master the art and science of validating regression models. Learn systematic techniques for analyzing residuals, testing normality, detecting heteroscedasticity, identifying influential observations, and diagnosing multicollinearity—essential skills for building reliable, production-ready regression models.","difficulty":"INTERMEDIATE","estimatedMinutes":75,"pages":[{"id":"seed_2ec0a15230f2da55ced82fc8aad6d13a","title":"Residual Analysis","order":0,"content":[{"id":"opening-hook","title":"The Detective Work of Regression","content":[{"data":{"content":"Every regression model tells two stories: the **signal story** (what the model captures about the relationship between predictors and response) and the **residual story** (what the model fails to explain). A fitted regression equation might look impressive on paper, but without examining **residuals**—the differences between observed and predicted values—we're flying blind.\n\nResidual analysis is the diagnostic lens through which we scrutinize our models. It reveals whether our assumptions hold, whether our predictions are reliable, and whether hidden patterns lurk in the data that our model missed. In this sense, residual analysis isn't just a validation step—it's **detective work**.\n\nThis page will equip you with the mathematical foundations, visual diagnostic tools, and practical intuition needed to conduct rigorous residual analysis. You'll learn to read residual plots like a radiologist reads an X-ray—identifying subtle anomalies that reveal deeper structural issues."},"type":"text"},{"data":{"icon":"Target","title":"What You Will Learn","content":"By the end of this page, you will understand how to define, compute, and interpret residuals; distinguish between different residual types (raw, standardized, studentized); construct and analyze key diagnostic plots; and recognize the specific assumption violations each plot reveals. This knowledge is essential for any production ML system built on regression.","variant":"info"},"type":"callout"}]},{"id":"defining-residuals","title":"Defining Residuals: The Foundation of Diagnostics","content":[{"data":{"content":"Let's establish the precise mathematical foundation. In a regression setting with response variable $y$ and fitted values $\\hat{y}$, the **residual** for observation $i$ is defined as:\n\n$$e_i = y_i - \\hat{y}_i$$\n\nThis deceptively simple quantity encapsulates everything the model cannot explain. If our model were perfect and the true relationship were deterministic, all residuals would be exactly zero. In practice, residuals arise from:\n\n1. **Random error** (irreducible noise in the data-generating process)\n2. **Model misspecification** (wrong functional form, missing predictors)\n3. **Measurement error** (imprecision in recorded values)\n4. **Violations of assumptions** (non-constant variance, non-independence)\n\nThe goal of residual analysis is to distinguish between these sources—determining whether observed residual patterns are consistent with random noise or indicative of systematic problems."},"type":"text"},{"data":{"icon":"Lightbulb","title":"Residuals vs. Errors: A Crucial Distinction","content":"Residuals (e_i) are observable estimates of the true errors (ε_i). The true error ε_i = y_i − E[y_i|x_i] involves the unknown population regression function, while the residual e_i = y_i − ŷ_i uses our estimated function. This distinction matters: residuals are correlated with each other and with fitted values in ways that true errors are not. Understanding this distinction is essential for proper inference.","variant":"tip"},"type":"callout"},{"data":{"content":"$72"},"type":"text"},{"data":{"rows":[["Zero sum","$$\\sum e_i = 0$","Intercept absorbs mean offset"],["Orthogonal to X","$$X^T e = 0$","No remaining linear signal in residuals"],["Orthogonal to ŷ","$$\\hat{y}^T e = 0$","Predictions and errors are uncorrelated"],["Expected value zero","$$E[e_i] = 0$","Unbiased on average"],["Variance relationship","$$\\text{Var}(e_i) = \\sigma^2(1-h_{ii})$","Variance depends on leverage"]],"caption":"Summary of OLS Residual Properties","headers":["Property","Mathematical Statement","Interpretation"]},"type":"table"}],"titleType":"number","titleNumber":1},{"id":"types-of-residuals","title":"Types of Residuals: Raw, Standardized, and Studentized","content":[{"data":{"content":"$73"},"type":"text"},{"data":{"icon":"Info","title":"The Hat Matrix Diagonal","content":"The diagonal element h_ii measures the 'leverage' of observation i—how much influence its x-values have on the regression fit. Values range from 1/n (for a point at the predictor centroid) to 1 (for perfectly high-leverage points). We'll explore leverage in depth when we cover influential points.","variant":"note"},"type":"callout"},{"data":{"content":"$74"},"type":"text"},{"data":{"rows":[["Raw","$$e_i = y_i - \\hat{y}_i$","Non-standard","Basic diagnostics, RSS"],["Standardized","$$e_i / \\hat{\\sigma}$","Approx. N(0,1)","Scale-free comparison"],["Internally Studentized","$$e_i / (\\hat{\\sigma}\\sqrt{1-h_{ii}})$","Approx. N(0,1)","Leverage-adjusted comparison"],["Externally Studentized","$$e_i / (\\hat{\\sigma}_{(i)}\\sqrt{1-h_{ii}})$","t(n-p-1)","Formal outlier testing"]],"caption":"Comparison of Residual Types","headers":["Residual Type","Formula","Distribution (under H₀)","Primary Use"]},"type":"table"},{"data":{"fileName":"residual_types.py","languages":[{"code":"$75","label":"Python","value":"python"},{"code":"# Residual analysis in R using built-in functions\n# R has excellent support for regression diagnostics\n\n# Generate example data\nset.seed(42)\nn <- 100\nx1 <- rnorm(n)\nx2 <- rnorm(n)\ny <- 2 + (-1)*x1 + 0.5*x2 + rnorm(n, sd = 0.5)\n\n# Add an outlier\ny[1] <- y[1] + 5\n\n# Fit model\nmodel <- lm(y ~ x1 + x2)\n\n# Extract different residual types\nraw_resid <- residuals(model) # Raw residuals\nstd_resid <- rstandard(model) # Internally studentized\nstud_resid <- rstudent(model) # Externally studentized\nleverage <- hatvalues(model) # Leverage (h_ii)\n\n# Compare for outlier observation\ncat(\"Observation 1 (outlier) residuals:\n\")\ncat(sprintf(\" Raw: %.4f\n\", raw_resid[1]))\ncat(sprintf(\" Internally Studentized: %.4f\n\", std_resid[1]))\ncat(sprintf(\" Externally Studentized: %.4f\n\", stud_resid[1]))\ncat(sprintf(\" Leverage (h_11): %.4f\n\", leverage[1]))\n\n# Formal outlier test using Bonferroni correction\noutlier_test <- car::outlierTest(model)\nprint(outlier_test)","label":"R","value":"r"}]},"type":"code"}],"titleType":"number","titleNumber":2},{"id":"residual-vs-fitted","title":"The Residual vs. Fitted Values Plot","content":[{"data":{"content":"The **residual vs. fitted values** plot is the workhorse of regression diagnostics. It reveals multiple assumption violations simultaneously and should be your first stop in any analysis.\n\n### Construction\n\nPlot residuals $e_i$ (or standardized/studentized versions) on the y-axis against fitted values $\\hat{y}_i$ on the x-axis. Each point represents one observation.\n\n### What a Good Plot Looks Like\n\nUnder correct model specification and valid assumptions, this plot should show:\n\n1. **Random scatter** around the horizontal line at zero\n2. **Constant vertical spread** across all fitted values (homoscedasticity)\n3. **No systematic patterns** (curves, trends, clusters)\n4. **No extreme outliers** (points far from the bulk)\n\nThe null pattern is a formless cloud—any structure reveals a problem."},"type":"text"},{"data":{"icon":"AlertCircle","title":"The Detective's First Tool","content":"The residual vs. fitted plot can reveal: (1) non-linearity (curved patterns), (2) heteroscedasticity (funnel shapes), (3) outliers (isolated points), and (4) missing predictors (systematic patterns). It cannot easily distinguish between these—additional plots are needed—but it alerts you that *something* is wrong.","variant":"warning"},"type":"callout"},{"data":{"content":"$76"},"type":"text"},{"data":{"fileName":"diagnostic_plots.py","languages":[{"code":"$77","label":"Python","value":"python"}]},"type":"code"}],"titleType":"number","titleNumber":3},{"id":"partial-residual-plots","title":"Component-Plus-Residual (Partial Residual) Plots","content":[{"data":{"content":"$78"},"type":"text"},{"data":{"icon":"Lightbulb","title":"CERES Plots: An Enhanced Alternative","content":"Component-plus-Residual plots assume other predictors have correct functional forms. If this is violated, patterns can be misleading. CERES (Combining conditional Expectations and RESiduals) plots address this by using smoother estimates instead of linear terms for other variables. 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