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Half-Normal Plot

A plot for diagnosing model inadequacy or revealing the presence of outliers, in which the absolute values of, for example, the residuals from a multiple regression are plotted against the quantiles of the standard normal distribution. Outliers will appear at the top right of the plot as points that are separated from the others, while systematic departures from a straight line could indicate that the model is unsatisfactory.

Half-Normal Plot

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