Dennis Roberts wrote: > > Since zs are a linear transformation of the raw data, I don't see how > converting data to z will get rid of anything ...
I think the op was describing using the within-subject z score (though I'm not sure). I've seen this done as a method of removing systematic variation due to differences in use of the scale - for example some people using all the scale and some only a small portion. Thom . . ================================================================ This list will soon be replaced by the new list EDSTAT-L at Penn State. Please subscribe to the new list using the web interface at http://lists.psu.edu/archives/edstat-l.html. ================================================================
