[R] Mean of matched data

robgriffin247 rg.rforum at hotmail.co.uk
Wed Jul 18 13:54:28 CEST 2012

in a way this has worked... with a slight modification to this:

which gives a table of the 24000 gene&gender means (narrow3) and the
standard deviations (narrow4)

which I then merge in to one df using


Is there a way I can lift the mean and std.dev. values from data frame
narrow5 and paste them to the original narrow2 df? In effect... R would read
what gene and gender each row of narrow2 has & then paste in the according
mean value in to a new column. then do the same for a new sd column. each
mean/sd value would occur in the new column 80 times (there are 80
occurrences of each gene&gender combination).


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