|From||Chris Wallace <email@example.com>|
|Subject||Re: st: RE: impute: too many variables specified|
|Date||Fri, 19 Nov 2004 10:34:41 +0000|
Nick Cox wrote:
This was asked a while back. I can't remember the answer but it should be in the archives.Thanks (and to Richard Williams and Kit Baum) - I found the mail and now understand the problem.
A quite different comment is to ask how much better your imputation is based on 30+ predictorsThe situation is that I have 17 biochemical variables, each measured twice (call them A1, A2, ..., Q1, Q2). Each of these need to be transformed into Xsum=X1+X2 and Xdiff=abs(X1-X2) - these will then be used in a score test.
rather than 30.