[R] Basic stratification calculations

From: <dvrecko_at_sfu.ca>
Date: Fri 04 Mar 2005 - 19:39:27 EST
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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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