| Fit Analyses |
A normal quantile-quantile plot of residuals is illustrated by the plot on the right in Figure 39.25. See the "Residual Normal Quantiles" section for an explanation of the X axis variable.
The empirical quantiles are plotted against the quantiles of a standard normal distribution. If the residuals are from a normal distribution with mean 0, the points tend to fall along the reference line that has an intercept of 0 and a slope equal to the estimated standard deviation.
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