Basic stratification calculations
Hi, if I understand correctly, tapply() is your friend here, vito
dvrecko at sfu.ca 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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==================================== Vito M.R. Muggeo Dip.to Sc Statist e Matem `Vianelli' Universit? di Palermo viale delle Scienze, edificio 13 90121 Palermo - ITALY tel: 091 6626240 fax: 091 485726/485612