Posted by
Beckstead, Jason-2 on
Feb 26, 2021; 5:10pm
URL: http://spssx-discussion.165.s1.nabble.com/GENLINMIXED-EMMEANS-don-t-agree-with-descriptives-tp5740214p5740224.html
Thanks Bruce. Below is small data and syntax.
* Encoding: UTF-8.
*-9 within-subjects conditions (3 x 3; AC x WT) & binary choice response.
*-below is hypothetical data from N=6 subjects.
*-At issue: estimated means do not agree with observed means.
DATA LIST FREE /SUB AC WT CHOICE.
BEGIN DATA.
1 1 1 0
1 1 2 0
1 1 3 0
1 2 1 0
1 2 2 1
1 2 3 1
1 3 1 1
1 3 2 1
1 3 3 1
2 1 1 0
2 1 2 0
2 1 3 1
2 2 1 0
2 2 2 0
2 2 3 1
2 3 1 0
2 3 2 1
2 3 3 1
3 1 1 0
3 1 2 1
3 1 3 0
3 2 1 1
3 2 2 1
3 2 3 0
3 3 1 1
3 3 2 1
3 3 3 0
4 1 1 0
4 1 2 0
4 1 3 0
4 2 1 1
4 2 2 1
4 2 3 1
4 3 1 1
4 3 2 1
4 3 3 1
5 1 1 0
5 1 2 0
5 1 3 0
5 2 1 0
5 2 2 0
5 2 3 0
5 3 1 0
5 3 2 0
5 3 3 0
6 1 1 1
6 1 2 1
6 1 3 1
6 2 1 1
6 2 2 1
6 2 3 1
6 3 1 1
6 3 2 1
6 3 3 1
END DATA.
VARIABLE LEVEL SUB AC WT (NOMINAL).
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
/RANDOM USE_INTERCEPT=TRUE SUBJECTS=SUB
/EMMEANS TABLES=AC*WT
/BUILD_OPTIONS TARGET_CATEGORY_ORDER=aSCENDING INPUTS_CATEGORY_ORDER=aSCENDING.
MEANS CHOICE BY AC BY WT.
_____________________________________________________________
Jason W. Beckstead, Ph.D.
Professor/Quantitative Methodologist
University of South Florida College of Public Health
13201 Bruce B. Downs Blvd., MDC56, Tampa, FL 33612, USA
Statistical Editor, International Journal of Nursing Studies
phone: +1.813.974.7667 fax: +1.813.974.4719
personal website:
http://personal.health.usf.edu/jbeckste/ International Journal of Nursing Studies
http://www.elsevier.com/ijns NOTE new email:
[hidden email]
-----Original Message-----
From: SPSSX(r) Discussion <
[hidden email]> On Behalf Of Bruce Weaver
Sent: Wednesday, February 24, 2021 2:18 PM
To:
[hidden email]
Subject: Re: GENLINMIXED EMMEANS don't agree with descriptives
Hello Jason. If you provide a small illustrative data set (via DATA LIST) along with your GENLINMIXED and MEANS commands, others might find it easier to help you figure out what's going on. (Folks who do not wish to take the time to generate such an example themselves may be willing to help if you provide it!)
Bruce
Beckstead, Jason-2 wrote
> Hello all,
>
> I am using GENLINMIXED procedure to analyze binary responses from a 3
> x 3 within-subjects design. Each subject provided 9 responses (coded
> 0, 1). I am running a multilevel logistic regression model specifying
> a binomial distribution and logit link function. I include a random
> intercept to account for the within-subjects data structure. The
> procedure executes fine without any errors or warnings.
> When I request the marginal means (and 95% C.I.s) with the /EMMEANS
> subcommand, however, the values provided by GENLINMIXED do not equal
> the values I get when I run MEANS procedure on the same data.
>
> Any help reconciling would be appreciated.
> Jason
-----
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Bruce Weaver
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