[R] summary stats on continuous data

[Daniel Malter]

Hi, you should be able to do most of your summaries using tapply() or
aggregate().

for your example, 

tapply(d$Acc,list(d$Sample),table)

Here tapply takes Acc, "splits" it by Sample, and then tables Acc (which
returns how many 0s/1s were observed in variable Acc for each stratum of
Sample).

HTH,
Daniel
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