In this paper [1] the author mentioned a procedure by M. Greenace that can be used to collapse the levels of a categorical variable by setting up a table with the frequency of each level and the proportion of the target value in each level. Then collapsing the table level by level looking at the change in chi-square as the table is collapsed. Does anyone know if such a procedure is available in R.
[1] http://www2.sas.com/proceedings/sugi31/079-31.pdf ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.