interactions on mixed models

[Jonathan David]

Hi, i had a question about using interactions in mixed models...

Just a little background I am looking at the effects of infant gender and maternal rank on the percentage of time spent in ventral contact. Percentage of time in ventral contact was the dependent variable, mother ID was included as a random effect, and a infant age (known as infant month), infant gender (male or female), and maternal rank.

As well as looking at the main effects, i also want to look at interaction effects.

So how would i make the command of finding the interaction between lets say infant age (infant month) and maternal rank?

Cheers


J

[Steve Samuels]

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