3dLMEr contrasts question

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1

Hello Gang et al.,

I have a 3dLMEr modeling question I am hoping you may be able to help with.

Is it possible to specify multiple contrasts in one model? Essentially, we have a Negative, Neutral, and No Distracter (none) condition. We want to first contrast both distracter conditions with the no distracter conditions, and then contrast the results with each other: (Negative > None) > (Neutral > None). Could we use something like this in the 3dLMEr model specification: -gltCode neg-neu ‘emotion : (1neg -1none) - (1neut -1none)’

Thank you in advance!

Amar

2

Amar,

Could we use something like this in the 3dLMEr model specification: -gltCode neg-neu ‘emotion : (1neg -1none) - (1neut -1none)’

That inference should be specified as

-gltCode neg-neu ‘emotion : 1neg -1none -1neut 1none’

which is equivalent to

-gltCode neg-neu ‘emotion : 1neg -1neut’