Hi dear listers
Do you know how to made a mean by one or more categorical variables?
I can do that quite easy on SAS by in R I just can't do it E.g.
Some fishes
Sex Lenght
male 15
fema 20
fema 17
fema 19
male 18
So the idea is mean(Lenght) by sex, in order to have sex: Male
mean=XX Sex: Fema mean=YY
In this case is quite easy to do it by a loop, but I have a huge DB
so is not an option. Any suggestion?
Thanks in advance!
--
Jorge Cornejo Donoso
Universidad Austral de Chile
Portales 73, Coyhaique,CP 5950000, Region de Aisén, Chile Tel +56 67 244520
Fax +56 67 239377
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