In the Hmisc package see function combine.levels
On Thu, 21 Aug 2003 09:06:21 +0200 "Christian Schulz" <[EMAIL PROTECTED]> wrote: > Hi, > > i use a data.frame with ~ 80.000 observations > and one attribute is a factor with > ~ 7300 levels. Is there a easy step which allow > me to filter out the the data with minimum frequencies i.e. 20 > cases per level. > So existing levels with < 20 cases in this factor attribute are deleted > from data.frame. > > many thanks and regards, > christian > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help --- Frank E Harrell Jr Prof. of Biostatistics & Statistics Div. of Biostatistics & Epidem. Dept. of Health Evaluation Sciences U. Virginia School of Medicine http://hesweb1.med.virginia.edu/biostat ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
