(This article was first published on SAS and R, and kindly contributed to R-bloggers)
A number of analyses perform operations on subsets. Making it clear what observations have been excluded or included is helpful to include in the output.SASThe where statement (section A.6.3) is a powerful and useful tool for subsetting on the fly. (Other options for subsetting typically require data steps or data set options in the proc statement.) But one problem with subsetting in SAS is To leave a comment for the author, please follow the link and comment on his blog: SAS and R.
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Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).