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 == levels(use$month)[1]) : 
        undefined columns selected
It seems if a logical variable is created, and the subsetting on a factor variable won't work directly.(It works directly for numeric variables)  
Can anyone help please.
 
Regards
Hennie Gerber
 

Hennie Gerber
Statistician
UNISA - Research Support
+ 27 12 429 3188
Waarskuwing!
Die sienings uitgespreek is my eie en nie noodwendig my werkgewer sin nie
Warning!
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