On 27/05/2015 11:56, Shivi82 wrote:
HI Jim,
Thanks for the help however R throws an error when i create a var
tot_mon_wt-
tot_mon_wt<-by(mwlc$MFST_WT,mwlc$Month,sum). It gives me an error =
Error in Summary.factor(c(1L, 1L), na.rm = FALSE) :
‘sum’ not meaningful for factors
Not sure what this error refers to.
Dear Shivi
It means that you have tried to use sum on a variable which is a factor.
You can easily convert it to numeric but if it were me I would want to
find out how it got turned into a factor before I transformed it.
Thank you, Shivi
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