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Re: st: RE: GLLAMM: logitic regression interaction non signficant but lincom gives signficant result


From   Joerg Luedicke <[email protected]>
To   [email protected]
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 <[email protected]> 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
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