search for: xtmepoisson

...g a non-linear trend for each region through random effects for linear splines components (see Durban et al, Stat Med 2005, or " Semiparametric regression" by Ruppert et al, 2003). I use the command 'glmmPQL' in the MASS package and replicated the analysis with Stata's 'xtmepoisson'. I obtained very different results, so I would like to try 'glmer' in the lme4 package. I guess the default correlation for the random effects in 'glmer' is unstructured, but this choice is absolutely unfeasible for this complex random effect nesting structure. Unfortunately,...