PROC GLIMMIX help needed!

tka726 — Thu, 04 Aug 2022 01:11:08 GMT

I’m running a glimmix model and wanted to make sure I am modelling the data correctly. Glimmix is a relatively new procedure for me.

Each subject was followed for 4 days, and they were randomized to one of two trainers. Subjects were with each trainer at least once, but could have been with one trainer 3 times and the other trainer once (like subject 3). At the end of each day, a test was given.

I’m trying to see if the scores differed depending on trainer, over the 4 days. Also interested in the differences in scores for each day.

This is a simplified snapshot of my actual data.

PTNO DAY TRAINER SCORE

1 1 1 50

1 2 2 60

1 3 1 55

1 4 2 45

2 1 1 70

2 2 1 72

2 3 2 90

2 4 2 85

3 1 1 67

3 2 1 79

3 3 1 80

3 4 2 85

...

Is this the correct model?

PROC GLIMMIX DATA=ads;

CLASS ptno trainer day;

MODEL score = trainer day trainer*day ;

random int / subject=ptno;

RANDOM day / subject=ptno*trainer type=un;

Run;

Re: PROC GLIMMIX help needed!

jiltao — Thu, 04 Aug 2022 12:35:21 GMT

I would probably add the RESIDUAL option to your second RANDOM statement --

RANDOM day / subject=ptno*trainer type=un residual;

Thanks,

Jill

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PROC GLIMMIX help needed!

Re: PROC GLIMMIX help needed!