[R] "Conditional" average

[R. Michael Weylandt]

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 <selamgetachew at 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...
>
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