[R] problems with simple statistical procedures

Uwe Ligges ligges at statistik.uni-dortmund.de
Sun Jul 2 14:57:50 CEST 2006

Thomas Preuth wrote:
> Hello,
> I use an imported dataframe and want to extract the mean value for one 
> column.
> after typing "mean (rae.df$VOL_DEP)" I receive
> "[1] NA
> Warning message:
> Argument ist weder numerisch noch boolesch: gebe NA zurück in: 
> mean.default("rae.df$POINT_Y_CH") "

   rae.df$VOL_DEP != "rae.df$POINT_Y_CH"

I think this is really strange. Are you sure this is the exact call and 
its output? If so, please tell us the output of

Uwe Ligges

> But when i look into the dataframe the column is characterized as numeric.
> Sorry for bothering but as a complete newbie I just cannot halp myself.
> Greetings,
> thomas
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