On Tue, Jun 16, 2009 at 03:14:01PM +0800, Mao Jianfeng wrote:
>
> > levels(d$population)<-c("YXPy01", "KMPy01", "YLPy01", "GSPy02", "BCPy01",
> "LJPy01", "GYPt01", "YLPd01", "CYPd01", "CYPd02", "CYPd03", "BXPd01",
> "NSPt01")
>
I'm not "at home" with factors myself, but maybe this will do the trick for
you:
d$population <- factor(d$population, levels=c("YXPy01", "KMPy01", "YLPy01", ..))
[just to avoid any confusion: you have to spell out all levels instead of using
'..'; R will not automagically guess them.]
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