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2002 Mar 19
2
Selecting cases from a data frame
...ysis on a subset of
that data frame, defined as the subset for which the value of OGMCAT (a
column in the data frame) is anything OTHER than 9, 11, or 12. So I'd
like to define a new data frame that consists of the same variables as in
acps.df, but without those cases. I tried this:
> acps.nopg.df<-acps.df[(acps.df$OGMCAT != 9) & (acps.df$OGMCAT != 11) &
(acps.df$OGMCAT != 12)]
but got this:
Error in "[.data.frame"(acps.df, (acps.df$OGMCAT != 9) & (acps.df$OGMCAT
!= :
undefined columns selected
Thanks for any advice.
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