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Parallel Lines in Residual Plots

Shayle R. Searle
The American Statistician
Vol. 42, No. 3 (Aug., 1988), p. 211
DOI: 10.2307/2685008
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Page Count: 1
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Attention is drawn to a little-known feature of residuals plotted against predicted values: When observed values of y are repeated in the data, then the plot exhibits a series of parallel lines having slope -1.

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