I get a curious error using bystats2 that I can not track down. I have two variables that are converted from dates and one numeric variable: > str(mon) Ord.factor w/ 12 levels "Jan"<"Feb"<"Mar"<..: 1 1 1 1 1 1 1 1 2 2 ... > str(yea) Ord.factor w/ 4 levels "2004"<"2005"<..: 3 3 3 3 3 3 3 3 3 3 ... > str(amount) num [1:1103] -44 -10 -17 -80 -20 -50 -58 -14 -28 -46 ... library(Hmisc) date = dates(as.character(Posted.Date)) month = months(date) year = years(date) yields the error > bystats2(amount,month,year) Error: object "n" not found thanks for any suggestions! Steve