I have created a series of "Custom Dialogues" for installation into SPSS. Many of these procedures are available elsewhere, but psychologists are often slow to adapt to procedures not available in SPSS. I have found these particular procedures useful and SPSS lacking, so I built these packages. The procedures are:
Additionally, if you would rather install the entire suite of programs here, you can do so with this file (I often do this when I update versions of SPSS).
If you are unfamiliar with custom dialogues, I refer you to Andrew Hayes's web link here.
Behavior Research Methods Journal Page