Despite being one of the most powerful computing platforms, and being free at the same time, R still struggles against other statistical software, such as SPSS and SAS, in gaining mass appeal amongst users of statistical and market intelligence software. Many have cited the absence of a user-friendly graphical user interface (GUI)...



Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).