[R] Mean Help

Hard Core gioxc at hotmail.it
Wed Oct 31 14:18:18 CET 2012

I have a dataframe.
Let's suppose that i have two columns. The first one contains height, the
second one contains eye color that can be Green, Blue or Brown.
I want to calculate the aritmetic mean of the height only for those people
who have Blue eyes. How can I do it?
Thank you for your availability.

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