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meanspc
2010 Jul 20
2
Means from selected columns in a data frame
Hi all,
I have a dataframe with survey data. Now I want to calculate means from several but not all columns (e.g. a1, a2, a3) and save them in a new separate column (e.g. a).
Like: a = mean(a1, a2, a3)
Can someone help me or give me the right key word to look for?
Thanks
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