Statistics and Probability Dictionary
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A residual plot is a graph that shows the
on the vertical axis and the independent variable
on the horizontal axis. If the points in a residual plot
are randomly dispersed
around the horizontal axis, a linear regression model is
appropriate for the data; otherwise, a non-linear model is more
Below, the residual plots show three typical patterns. The
first plot shows a random pattern, indicating a good
fit for a linear model.
The other plot patterns are
non-random (U-shaped and inverted U), suggesting a better fit
for a non-linear model.
Non-random: U-shaped curve
Non-random: Inverted U