Counting duplicates in a dataframe
Hi
-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
project.org] On Behalf Of asafwe
Sent: Monday, October 22, 2012 4:02 AM
To: r-help at r-project.org
Subject: [R] Counting duplicates in a dataframe
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.
How is it realated with duplicates? Do you want something like that? xtabs(~Gender+Dosage, data=some.data.frame) Regards Petr
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 -- View this message in context: http://r.789695.n4.nabble.com/Counting- duplicates-in-a-dataframe-tp4646954.html Sent from the R help mailing list archive at Nabble.com.
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