Re: GENLINMIXED EMMEANS don't agree with descriptives

Posted by Bruce Weaver on Feb 28, 2021; 2:27am
URL: http://spssx-discussion.165.s1.nabble.com/GENLINMIXED-EMMEANS-don-t-agree-with-descriptives-tp5740214p5740228.html

"If you don't estimate random effects the two procedures match."

Aha.  Good observation, Andy.  However, to one of Jason's points, the limits
of some CIs are < 0 or > 1.  Using the small dataset Jason provided, and
excluding random effects yields these EMMEANS:


Estimates
AC WT Mean Std. Error 95% Confidence Interval
                                Lower Upper
1 1 .167 .152 -.140 .473
        2 .333 .192 -.054 .721
        3 .333 .192 -.054 .721
2 1 .500 .204 .089 .911
        2 .667 .192 .279 1.054
        3 .667 .192 .279 1.054
3 1 .667 .192 .279 1.054
        2 .833 .152 .527 1.140
        3 .667 .192 .279 1.054



Andy W wrote

> Bruce, those should only change the standard error of the means, not the
> mean
> estimate itself (at least that is the case for data with only discrete
> dummy
> variables like here).
>
> Here I am not sure how SPSS treats the random effect in EMMEANS (sets it
> to
> 0 I imagine). If you don't estimate random effects the two procedures
> match.
>
> MEANS CHOICE BY AC BY WT.
>
> GENLINMIXED /DATA_STRUCTURE SUBJECTS=SUB
>  /FIELDS TARGET=CHOICE TRIALS=NONE OFFSET=NONE
>  /TARGET_OPTIONS DISTRIBUTION=BINOMIAL LINK=LOGIT REFERENCE=0
>  /FIXED EFFECTS= AC WT AC*WT USE_INTERCEPT=TRUE
>  /EMMEANS TABLES=AC*WT
>  /BUILD_OPTIONS TARGET_CATEGORY_ORDER=aSCENDING
> INPUTS_CATEGORY_ORDER=aSCENDING.
>
>
>
>
>
>
> -----
> Andy W

> apwheele@

> http://andrewpwheeler.wordpress.com/
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Bruce Weaver
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