I was wondering how to graph regression lines to depict the slope of y on x
at various levels of z when there is an xz interaction and both are
continuous variables. For example, if one wanted to look at the x slope at
+/- 1 SD of z. I have done this in Stata 7 and it seemed a rather convoluted
process. I was wondering if anything in Stata 8 makes this easier.
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