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From | Joerg Luedicke <joerg.luedicke@gmail.com> |
To | statalist@hsphsun2.harvard.edu |
Subject | Re: st: RE: GLLAMM: logitic regression interaction non signficant but lincom gives signficant result |
Date | Sat, 19 May 2012 06:35:45 -0700 |
In your model, you are testing whether the two slopes are sign. different from each other. With the -lincom- test you are testing whether the second slope is sign. different from zero. Those are obv. different tests. Besides, make sure you got the denominator right. I am not sure how -gllamm- handles it but I know of other software that want _total minus success_ (i.e. failure) as the denominator, _not_ total. J. On Sat, May 19, 2012 at 5:51 AM, Brendan Halpin <brendan.halpin@ul.ie> wrote: > On Sat, May 19 2012, Abdelouahid Tajar wrote: > >> But my model >> shows that the interaction is non signficant the slpoe of time for the >> reference (group 0) is non significant but the time slope for group 1 is >> significant hence the confusion. > > Google "the difference between significant and not significant is not > significant" for an interesting discussion on this topic. > > Brendan > -- > Brendan Halpin, Department of Sociology, University of Limerick, Ireland > Tel: w +353-61-213147 f +353-61-202569 h +353-61-338562; Room F1-009 x 3147 > mailto:brendan.halpin@ul.ie ULSociology on Facebook: http://on.fb.me/fjIK9t > http://teaching.sociology.ul.ie/bhalpin/wordpress twitter:@ULSociology > * > * 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/