RE: [R] newbie's question about dataframe

From: Liaw, Andy <andy_liaw_at_merck.com>
Date: Sat 26 Mar 2005 - 00:24:14 EST


Something like this should do it:

 dat$Z <- with(dat, as.numeric(Y >= Y[order(Y, decreasing=TRUE)[10]]))

Andy

> From: Wensui Liu
>
> I have a dataframe containing X and Y. Right now, I want to create
> another variable in the dataframe, named Z, such that for Z = 1 for
> the top 10 largest value of Y and Z = 0 for the rest values of Y.
>
> I really appreciate your help. Have a great weekend.
>
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>
>



R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sat Mar 26 00:31:32 2005

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