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johncolby/sub_means_example.R

Created June 22, 2011 17:23
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An example showing how to obtain the mean for each subject across multiple observations in a data frame
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sub_means_example.R
library(plyr)
data = arrange(data.frame(ID=1:10, FA=runif(50, 0.2, 0.8)), ID)
ddply(data, 'ID', mean) # using plyr library
aggregate(data, list(ID=data$ID), mean) # using base
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