Residual Plots. 15.3. Residuals. The difference between actual data points and ones predicted by the regression line (line of best fit). If the residuals are small, the model is good. Predicted Value. Residual. Observed Value. Finding Residuals. From the graph.
From the graph
From the equation (predicted outcomes)
The top two graphs show residuals that are too large (too high on the y-axis)
The bottom two graphs show patterns which mean we shouldn’t use a linear model