[R] howto calculate column means in data frame
Maas James Dr (MED)
J.Maas at uea.ac.uk
Sun Apr 10 17:27:33 CEST 2011
Long story short, I have a big iterative procedure that produces a long list of data.frames such as the one called
"results" here. Is there an easy way to produce a similar list of data.frames comprised of the mean of each of the
columns in results, such that it ends up like the one I've shown in "resultsmean" below?
I've tried apply and lapply, still not got the correct arguments. As usual, TIA.
Jim
> results
[[1]]
name LOR23 BIA23 MSE23 H0R23
1 0.2111122 -1.012228 -0.095937 0.035650 1.00
2 0.2111122 -0.836300 0.079991 0.042322 0.75
3 0.2111122 -0.518631 0.397659 0.214593 0.50
[[2]]
name LOR23 BIA23 MSE23 H0R23
1 0.2211122 -0.724630 0.191660 0.051308 1
2 0.2211122 -0.781812 0.134478 0.033872 1
3 0.2211122 -0.522109 0.394181 0.164628 0.75
would like
> resultsmean
[[1]]
name LOR23 BIA23 MSE23 H0R23
1 0.2111122 -0.78333 0.12734 0.097160 0.75
[[2]]
name LOR23 BIA23 MSE23 H0R23
1 0.2211122 -0.67566 0.2400 0.08266 0.916
===============================
Dr. Jim Maas
University of East Anglia
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