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Topic:
Fitting a Simple Linear Regression
Why the Fitted Line Passes Through the Data Centroid
Why Least Squares Is Not Absolute-Error Fitting
When the Least-Squares Slope Is Zero
When the Predictor Has No Variation
What a Straight-Line Fit Leaves Unexplained
Translating a Slope Into a Multi-Unit Change
The Zero-Sum Residual Property
The Simple Regression Equation
The Slope Formula from Centered Data
Residuals Are Orthogonal to Predictor Values
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