In base R, you probably want either ave() or tapply() (depending on how you want your results formatted) for a quick and dirty solution. aggregate() will get you there and allow more powerful transformations with a little more work. All of these have examples in the help pages that should get you started.
Michael On Tue, Apr 24, 2012 at 9:23 PM, kebrab67 <selamgetac...@gmail.com> wrote: > Hello, I have a set of data including age, wage and education level each > called age76, wage76 and grade76 I want to know how i can calculate the > average wage of people age 15 to 65 (each year separetly) , only for those > who have an education level of 10 12 and 16... > > -- > View this message in context: > http://r.789695.n4.nabble.com/Conditional-average-tp4585313p4585313.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
