Re: [R] Interaction term in lmer

On 6/1/07, emine özgür Bayman <[EMAIL PROTECTED]> wrote: > Dear R users, > I'm pretty new on using lmer package. My response is binary and I have fixed > treatment effect (2 treatments) and random center effect (7 centers). I want > to test the effect of treatment by fitting 2 models: > > Model 1:

Re: [R] Interaction term in lmer

HI Emine, The parentheses specify a variable as random or fixed. You are using center for random intercepts, but fixed for interactions. You may want > mer(cbind( yvect, nvect-yvect) ~ trt + ( 1 | center) + (1 | > trt:center), > family = binomial, niter = 25, method = "Laplace", control = l

[R] Interaction term in lmer

Dear R users, I'm pretty new on using lmer package. My response is binary and I have fixed treatment effect (2 treatments) and random center effect (7 centers). I want to test the effect of treatment by fitting 2 models: Model 1: center effect (random) only Model 2: trt (fixed) + center (random)