Hello, does anyone know how to take the mean for a subset of observations?
For example, suppose my data looks like this:

OBS     NAME   SCORE
1          Tom       92
2          Tom       88
3          Tom       56
4          James    85
5          James    75
6          James    32
7          Dawn     56
8          Dawn     91
9          Clara     95
10        Clara     84

Is there a way to get the mean of the SCORE variable by NAME but only when
the number of observations is equal to 3?  In other words, is there a way to
get the mean of the SCORE variable for Tom and James, but not for Dawn and
Clara?  Thank you.

-- 
Geoffrey Smith
Visiting Assistant Professor
Department of Finance
W. P. Carey School of Business
Arizona State University

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