I think that title makes sense... I hope it does...
I have a data frame, one of the columns of which is a factor. I want
the rows of data that correspond to the level in that factor which
occurs the most times.
So first you want to determine the mode (in the sense of the most frequently occuring value) of the factor. One way to do this is
names(which.max(table(fac)))
Use this comparison for the subset as
subset(data, pattern == names(which.max(table(pattern))))
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