GLM, GRM, and MANOVA Syntax - Keyword Lackoffit

Optional keyword; requests the computation of pure error for testing the lack-of-fit hypothesis; the default is LACKOFFIT = NO.

When the lack-of-fit test is requested, on reading the data, STATISTICA will compute the sums of squares for the pure error, i.e., the sums of squares within all unique combinations of values for the (continuous and categorical) predictor variables. On the GLM Results dialog, options are available to test the lack-of-fit hypothesis.