On Oct 22, 2012, at 7:48 AM, arun wrote:
> HI,
> Another way:
> dat1<-read.table(text="
> 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
> ",sep="",header=TRUE,stringsAsFactors=FALSE)
>
>
> tapply(dat1$Observation,list(dat1$Gender,dat1$Dosage),length)
> # a b
> #f 4 4
> #m 4 4
How is that different than:
table(dat1$Gender, dat1$Dosage)
--
David.
> A.K.
>
> ----- Original Message -----
> From: asafwe <as...@wharton.upenn.edu>
> To: r-help@r-project.org
> Cc:
> Sent: Sunday, October 21, 2012 10:02 PM
> 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.
>
> 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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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
Alameda, CA, USA
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
