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
