thank you!
sigalit.
---------- Forwarded message ----------
From: sigalit mangut-leiba <[EMAIL PROTECTED]>
Date: Jul 19, 2007 7:03 PM
Subject: tapply
To: r-help <[email protected]>
I'm sorry for the unfocused questions, i'm new here...
the output should be:
class aps_mean
1 na
2 11.5
3 8
the mean aps of every class, when every id count *once*, for example: class
2, mean= (11+12)/2=11.5
hope it's clearer.
sigalit.
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