[R] Remove levels

[Albin Blaschka]

Am 13.06.2013 14:02, schrieb Shane Carey:
> I have a dataframe consisting of factors in one column. Im trying to remove
> certain levels using the following code:
> toBeRemoved1<-which(DATA$UnitName_1=="lake")
> DATA<-DATA[-toBeRemoved1,]
>
> However it will not remove the level "lake"

Hello!

Is this a part of the R Inferno?
See "The R Inferno" from Patrick Burns, specially Chapter 8.2.4 
"dropping factor levels ", page 83

http://www.burns-stat.com/pages/Tutor/R_inferno.pdf

HTH,
Albin


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