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Putz Z in lmer
2 messages · Eder David Borges da Silva, Douglas Bates
2 days later
On Wed, Aug 17, 2011 at 3:09 PM, Eder David Borges da Silva
<eder at leg.ufpr.br> wrote:
Dear group members Imagine a mixed model y = Xb + Zu + e, Xb = fixed, random = Zu, is possible in lme4: lmer declare the matrix of random effects for the adjustment?? Is there a function that allows to adjust this model stating the matrix Z and X?
Not directly and, even if you could, it would not be sufficient to specify Z - you also need to specify the form of the variance-covariance matrix of the random effects and how it is generated from the parameters to be optimized. We do plan to provide facilities to do this in a future release.