Janet - You need two rows of C because you have a 2 df comparison - e.g. 1
vs 2 and 1 vs 3 (or equivalently 1 vs 2 and 2 vs 3 , etc). So what if you
try
Mat c=(1,-1,0,0,0,0 \ 1,0 -1,0,0,0)
Test(c)
I can't check this since I don't have Stata 9 yet.
Al Feiveson
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Janet Rait
Sent: Wednesday, May 25, 2005 9:37 AM
To: [email protected]
Subject: st: Re: Contrasts [Stata 9]
Can somebody please put me out of my misery. I have a simple oneway anova
with 6 treatments. I can contrast any pair of treatments after anova using
mat c1=(0,1,-1,0,0,0,0) test, test(c1) etc. But what I want to do is just
compare treatments 1, 2 and 3 and for the life of me I cannot get the matrix
in the right form mat c2=(0,1,1,1,-1,-1,-1) seems to comapre 1,2,3 with
4,5,6.
Thanks,
Janet
_________________________________________________________________
Be the first to hear what's new at MSN - sign up to our free newsletters!
http://www.msn.co.uk/newsletters
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
