Hi All,

I have a factor variable with 52 levels -with long, annoying names.  I want to keep only rows with some variables.  I can do this using this code:

test1 <- subset(nih2009,ic_name %in% c('NATIONAL EYE INSTITUTE','Veterans Affairs'))
dim(test1)

[1] 2396   38

But this doesn't work:

t1 <- subset(nih2009, ic_name %in% c(27,51))
dim(t1)
[1]  0 38


I know there's a way to do this.  Any help?  Thanks,

Rachel

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