Hi Al,
Looking into your question briefly I came across this:
http://www.uvm.edu/~dhowell/gradstat/psych341/lectures/Factorial2Folder/Median-split.html.
Looked interesting. Anyway, there is no direct way of doing a mean
split but it would be easy enough to do in a couple of steps using
SOFA:
1) identify median value of a variable doing a row table with that
variable as the column variable
2) recode the variable into two groups depending on >= that value
3) analyse using the new binary variable
A solution?
All the best,
Grant