Displaying 1 result from an estimated 1 matches for "kkg151gp".
2005 Apr 06
2
conditional selection with Factors
Hi All,
I want to select a level of a factor variable from a dataset. I have the folowing data:
dataset: use
factor: month (use$month, levels=February, July)
> use[1:5,]
month registration use department size
1 February KKG151GP Y Safety 1.6
To select February I tried:
> use[use$month=="February"]
Error in "[.data.frame"(use, use$month == "February") :
undefined columns selected
> use[use$month == levels(use$month)[1]]
Error in "[.data.frame"(use, use$month ==...