Hi, if I understand correctly, tapply() is your friend here,
vito
[EMAIL PROTECTED] wrote:
Hi. I'm a student at SFU in Canada. The basic thing I want to do is
calculate means of different strata. I have 2 vectors. One has the values I
want to take the means from, the other is the four strata I am interested
in. So I essentially want to break up the information vector into the four
strata and calculate four means, one for each stratum. How can I do this in
a reasonable way?
Thanks very much. Dean Vrecko
PS: Incidentally I forget how to see the code of functions. Does anyone remember the command to do this?
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Would split(y,f) be of some help here? And then you could find the mean for each level of f:
y.split <- split(y,f) mean(y.split$"0") mean(y.split$"1") mean(y.split$"2") mean(y.split$"3")
Clint
-- Clint Harshaw, PhD EMail: [EMAIL PROTECTED] Department of Mathematics Phone: 864.833.8995 Presbyterian College Fax: 864.938.3769 Clinton SC 29325 Office: Harrington-Peachtree Rm 412
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