(This article was first published on Greg's Research » R, and kindly contributed to R-bloggers)
Calculating characteristics such as median, mean,… of a subset of data is quite straightforward in R:
For a data set containing results from several “models”, a subset for the model “base” is created by
base_only <- subset(all, all$model == "base")
Then, the median of the variable “data” can be computed via
median(base_only$data)
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