[R] How to calculate?

From: stat4u <mfaisal_16_at_yahoo.com>
Date: Sat, 15 Nov 2008 07:31:15 -0800 (PST)

hi,
How can i calculate means with catergory of variable...

like

x y z
2 3 y
3 4 n
1 2 y
6 3 n
9 1 y
2 2 n
8 3 y

i want to get mean of x and y with respective to its category(y,n)

thanks...
regards,
Muhammad Faisal

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