how to pass 'weights' to mixed()

[S McIntyre]

Hello,

I have a mixed effects model with the following:
pCorrect: dependent variable, a proportion
nTotal: number of values used to compute pCorrect
touchType: between subjects IV (fixed effect)
cued: within subjects IV (fixed effect)
exptPID: participant ID (random effect)

The following works ok:

> glmer(pCorrect ~ touchType + cued + (1 |exptPID), 
      weights=nTotal, family=binomial, data = touchCompare)

but this gives me an error:

> mixed(pCorrect ~ touchType + cued + (1 |exptPID), 
      weights=nTotal, family=binomial, data = touchCompare)

Error in mixed(pCorrect ~ touchType + cued + (1 | exptPID), weights = nTotal,  : 
  object 'nTotal' not found

But the help file for mixed says:

… further arguments (such as weights/family) passed to lmer/glmer, such as control.

So it seems that passing the weights argument should be supported. Am I doing something wrong?

[henrik]

Yeah, that should probably be better documented. You need to pass the whole vector:

> mixed(pCorrect ~ touchType + cued + (1 |exptPID), 
      weights=touchCompare$nTotal, family=binomial, data = touchCompare)

[S McIntyre]

Thank you, that worked! And thanks for the quick reply.

[Author]

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