Model fit after false convergence
On Tue, 27 Oct 2009, Luciano La Sala wrote:
Dear R-crew, I am using lmer to fit a model for epidemiological data. I start from a saturated model containing all the main effects of interest (all with p < 0.25 in a bivariate screening) plus one random intercept (please see below). From there, I need to refine my model based on AIC criterion. As you can see below, I'm getting a convergence error after fitting the saturated model, which I don't know how to deal with.
Does the equivalent fixed effects model (ignoring nest) converge? Maybe there is separation. Cheers, David Duffy.