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Re: st: SimpleSlopes in Multilevel Models


From   "Kerstin Alfes" <KAlfes@gmx.de>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: SimpleSlopes in Multilevel Models
Date   Sat, 04 Feb 2012 17:31:31 +0100

Hello Stas

I am using stata 11.1, this is an example of my syntax

xtmixed logPerformance1 Question33 v_246 ZSchaufeli_Short zpos EExPOS || Team: ZSchaufeli_Short zpos, mle variance

This is the output I get and I would like to probe the interaction term EExPOS further and find out whether the simple slopes are significant. 

logPerform~1       Coef.   Std. Err.      z    P>|z|     [95% Conf. Interval]
  Question33    .0027937   .0242461     0.12   0.908    -.0447277    .0503151
       v_246   -.0003632   .0007304    -0.50   0.619    -.0017947    .0010683
ZSchaufeli~t    .0142171   .0112795     1.26   0.208    -.0078902    .0363244
        zpos   -.0049291   .0096467    -0.51   0.609    -.0238363    .0139781
      EExPOS   -.0141973   .0070321    -2.02   0.043      -.02798   -.0004145
       _cons    .7707479   .0306269    25.17   0.000     .7107203    .8307755

Best wishes
Kerstin

-------- Original-Nachricht --------
> Datum: Sat, 4 Feb 2012 10:44:49 -0500
> Von: Stas Kolenikov <skolenik@gmail.com>
> An: statalist@hsphsun2.harvard.edu
> Betreff: Re: st: SimpleSlopes in Multilevel Models

> In Stata, the output of every estimation command is accompanied with
> the default test that this coefficient is equal to zero (which is
> sensible for most slopes and correlations, although may not be so
> sensible for variances). Moreover, every coefficient can be tested
> with -test- command. Its syntax is daunting for a beginner, but you'd
> start appreciating it very quickly as you move from your MPlus or
> LISREL or MLWin experience.
> 
> If you gave an example of your syntax (that's what FAQ very strongly
> suggests) and your output, we could help with the specific -test-
> command.
> 
> On Sat, Feb 4, 2012 at 10:15 AM, Kerstin Alfes <KAlfes@gmx.de> wrote:
> > Dear All
> >
> > I ran a multilevel regression using the xtmixed command in stata.
> >
> > I have a significant interaction term between two level 1 variables and
> I
> > would like to test the simple slopes now. It seems that I need the
> > Asymptotic Covariance Matrix to do this. Does anbody know how to get the
> > ACOV in STATA? Or, is there an alternative way to test the significance
> of
> > the simple slopes?
> >
> > Many thanks
> > Kerstin
> > --
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> 
> 
> 
> -- 
> Stas Kolenikov, also found at http://stas.kolenikov.name
> Small print: I use this email account for mailing lists only.
> 
> *
> *   For searches and help try:
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-- 
Kerstin Alfes

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57482 Wenden
Germany
Phone: +49-(0)2762-2766
Mobile: +49-(0)174-160 15 44

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*
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*   http://www.ats.ucla.edu/stat/stata/


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