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Dear mixed modelers, Is there any package for calculating R2 measures for mixed models in R (e.g. using the measure proposed by Mittlbock; Waldhor 2000)? Luisa

Dear R-helpers, I'm looking for a quick way to calculate triple integrals. I have tried something like this example: f <- function(x,y,z) dnorm(x)*dnorm(y)*dnorm(z) llim <- -Inf ulim <- Inf integrate(function(z) { sapply...

Dear Carsten Dormann, I would like to know if the quantitative linkage density measure given by bipartite is weighted or not? I couldn't find this information on the package manual or on previous posts from R-help.in Tylyanakis...

Hello , I?ve only installed R (R 3.4.0 GUI 1.70 El Capitan build (7338)) a few days ago . Now every time I try to install a package I can?t even see the list of packages and...

Dear R-help, I am having problems using package lme4. I am trying to analyse the effect of a continuous variable (Dist_NV) on a count data response variable (SR_SUN) using Poisson error distribution. However, when I run the...

Dear All Can anyone help me? fit <- arima(USAccDeaths, order = c(0,1,1),seasonal = list(order=c(0,1,1)))) fit$sigma2 [1] 99346.89 So, the standard error for my first step prediction is sqrt(fit$sigma2)=315...

Dear R users, I am having problems using package lme4. I am trying to analyse the effect of a continuous variable (Dist_NV) on a count data response variable (SR_SUN) using Poisson error distribution. However, when I run the...

Hi, Usually species richness data have very heterogeneous variance, so they are better described by a Poisson distribution than by a Gaussian. you should probably analyse your data with Generalized Linear Models using function lmer (from package lme4) and specify...

Hi Steve, Thanlks for reply and literature list. Here are 3 papers on R2 calculations for Mixed Models: M. Mittlbock, T. Waldhor. Adjustments for R2-measures for Poisson regression models. Computational Statistics & Data Analysis 34 (2000) 461-472 M. Mittlbock...

Dear Douglas, Thank you for your reply. Just some extra info on the dataset: In my case Number of obs is 33, and number of groups of factor(Farm_code) is 12. This is the information on iterations I get...

Dear users, I'm using rpart for classification trees, but my code isn't working when I try to use all the variables in my data frame. This data frame was created from a data frame with 1775 variables, but...