![]() ![]() ![]() The sample SPSS command syntax file provided here is a translation of a SAS command file written by Jenn-Yun Tein of Arizona State University. This technical note will provide a sample SPSS command syntax file, which researchers may use to apply a modification of the Johnson-Neyman technique due to Potthoff (1964). Johnson and Neyman (1936) developed a technique for determining regions of significance when there is a significant group-by-covariate interaction. The values sxsqr1 and sxsqr2 should be the sums of squared deviations of the X or predictor variable around its within-group means, not the predicted sums of squares from the within-groups regressions of Y on X. IMPORTANT NOTE: Please note that the formulas given in Aiken & West for the modified Johnson-Neyman technique contain an error.
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