On Jan 27, 2012, at 17:18 , R. Michael Weylandt wrote:
> It doesn't have anything to do with attach (which is naughty in other ways!)
> rather it's the internal representation of categorical variables (R speak:
> factors) that store each level as an integer for memory efficiency but print
> t
It doesn't have anything to do with attach (which is naughty in other ways!)
rather it's the internal representation of categorical variables (R speak:
factors) that store each level as an integer for memory efficiency but print
things with string levels so they look nice to the user.
You'll
I am confused whether Student's sleep data "show the effect of two
soporific drugs" or Control against Treatment (one drug). The reason
is the next:
> require(stats)
> data(sleep)
> attach(sleep)
> extra[group==1]
numeric(0)
> group
[1] Ctl Ctl Ctl Ctl Ctl Ctl Ctl Ctl Ctl Ctl Trt Trt Trt Trt Trt T
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