In 1987, Jennings enumerated data analysis procedures
that authors must follow for analyzing effects in repeated
measures designs when submitting papers to Psychophysiology.
These prescriptions were intended to counteract the effects
of nonspherical data, a condition know to produce biased
tests of significance. Since this editorial policy was
established, additional refinements to the analysis of
these designs have appeared in print in a number of sources
that are not likely to be routinely read by psychophysiological
researchers. Accordingly, this paper includes additional
procedures not previously enumerated in the editorial policy
that can be used to analyze repeated measurements. Furthermore,
I indicate how numerical solutions can easily be obtained.