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spssmixed-modelslongitudinal
Welton Leung
Welton Leung

Reputation: 1

SPSS - How to specify the order of factors in linear mixed models (MIXED) in SPSS syntax?

SPSS Output

I was running some linear mixed models for a clinical trial, using treatment assignment ("Group") and timepoint ("Visit") as the factors.

In the output, Visit=6 was set as the reference group by default. Is there any way to specify in the syntax that allows me to use Visit=1 as the reference instead?

I visited the IBM documentations (https://www.ibm.com/docs/en/spss-statistics/beta?topic=reference-mixed) but still couldn't figure it out. Any advice would be appreciated!

The workaround I could think of right now is to recode the variable like by taking 7 minus the original number (i.e. Visit = 7-Visit) but that could create confusion down the road so I don't really prefer this method.

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