[R] Counting duplicates in a dataframe
asafwe
asafw at wharton.upenn.edu
Mon Oct 22 04:02:09 CEST 2012
Hello,
I am looking at a two-way ANOVA dataset, and would like to count the rows in
the dataframe with the same level of the first factor ("Gender") and the
second factor ("Dosage"). In other words, I am interested in the number of
observations per each "cell" in a (not necessarily balanced) two-way layout.
What is the simplest way to do this?
Thanks a lot,
Asaf
Observation Gender Dosage Alertness
1 1 m a 8
2 2 m a 12
3 3 m a 13
4 4 m a 12
5 5 m b 6
6 6 m b 7
7 7 m b 23
8 8 m b 14
9 9 f a 15
10 10 f a 12
11 11 f a 22
12 12 f a 14
13 13 f b 15
14 14 f b 12
15 15 f b 18
16 16 f b 22
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