[R] Help on Histogram ~ Barplot

Michael Dewey lists at dewey.myzen.co.uk
Wed May 27 14:46:02 CEST 2015

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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