Message-ID: <1351689498808-4648000.post@n4.nabble.com>
Date: 2012-10-31T13:18:18Z
From: Hard Core
Subject: Mean Help
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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