Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down at the end of May, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

st: RE: Factor Analysis of Individually Matched Case Control Study with collinearity problem


From   "Kieran McCaul" <Kieran.McCaul@uwa.edu.au>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Factor Analysis of Individually Matched Case Control Study with collinearity problem
Date   Wed, 4 Aug 2010 17:36:15 +0800

...

have you tried -exlogistic-?  

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of alexandra Clarke
Sent: Wednesday, 4 August 2010 5:04 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: Factor Analysis of Individually Matched Case Control Study with collinearity problem

Dear All,
I was wondering how to go about doing a Factor Analysis of an individually matched Case-Control study in STATA 11 with one control per case and 25 cases. I am unable to build a multivariable model using Conditional Logistic Regression with more than 3 terms due I think to a collinearity problem and so have not been able to assess for confounding and interaction properly. I have performed a factor analysis on the whole data set, not taking into account the matching, which has helped me to merge some variables. My outcome is binary, obviously, but I have binary, categorical, ordinal and continuous explanatory variables. Also, what is the best way of assessing collinearity with this type of data. I made a table of all my explanatory variables relationships with each other using Conditional Logistic Regression, which has again helped partially, and have tried the VIF and COLLIN commands, but don't really know what I am doing and need to account for matching. 
With best wishes,
A

 




      

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index