(This article was first published on Econometrics_Help, and kindly contributed to R-bloggers)
Rstudio has changed its website extension from rstudio.org to rstuido.com/ide and kept its new preveiw version at below link, few new things as "package development" tools are included in this version that makes job easy to develop new package.http://www.rstudio.com/ide/download/preview
Enjoy R programming.
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Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).