[R] False convergence error with lmer (package lme4) - What does it mean?

Hello, I've run 7 candidate models using mixed-effects logistic regression with the lmer function from the lme4 package, and I'm getting the following error for 5 of those models: Warning message: In mer_finalize(ans : false convergence (8). The candidate models all run with the same data,

[R] Problem with loading package Matrix

Hello, I recently upgraded from R 2.6.1 to 2.6.2. I uninstalled 2.6.1, installed 2.6.2, and installed the packages I regularly use. Everyting seems to be running properly, including most of the packages, but when I try to call the Matrix package, I get the following error: require(Matrix)

[R] Problem with specifiying column widths in layout

I am trying to generate a graphic with a matrix of 9 line graphs (3 rows, 3 columns), all with the same y-axis range, and only showing the y-axis labels and title at the left edge of each row of the matrix. I have been trying to use the widths argument in layout to specify a larger column width

[R] How can I extract the AIC score from a mixed model object produced using lmer?

I am running a series of candidate mixed models using lmer (package lme4) and I'd like to be able to compile a list of the AIC scores for those models so that I can quickly summarize and rank the models by AIC. When I do logistic regression, I can easily generate this kind of list by creating the

[R] Adehabitat package question - trying to generate animal home ranges

Hello, I'm new to R and am trying to use the adehabitat package for home range and habitat selection analysis for some animal radiotelemetry data sets I have, but I can't get the home range functions (mcp kernelUD) to work with my data. I think that my problem is that I don't properly