[R] newbie's question about dataframe

[Liaw, Andy]

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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