Re: [R] How to do more advanced cross tabulation in R?

From: tom soyer <tom.soyer_at_gmail.com>
Date: Tue, 22 Jan 2008 19:50:27 -0600

Thanks Charles and Gabor! Sorry Charles, the numbers were wrong in my example. You had the correct one.

On 1/22/08, Charles C. Berry <cberry_at_tajo.ucsd.edu> wrote:
>
> On Tue, 22 Jan 2008, tom soyer wrote:
>
> > Hi,
> >
> > I am trying to reproduce some functionalities of Excel pivot table in R,
> > sadly, I couldn't figure out how to do it. I am wondering if this is
> even
> > possible in R. Does anyone know?
> >
>
> Using 'ftable()', I can match your format, but the cell values differ:
>
> > ftable(xtabs(sales~year+quarter+company, data=df),row.vars=3)
> year 2003
> quarter 1 2 3 4
> company
> a 1 5 9 13
> b 2 6 10 14
> c 3 7 11 15
> d 4 8 12 16
> >
>
> Are you sure you got everything right in your example?
>
> HTH,
>
> Chuck
>
> > Here is an example:
> >
> > year=rep(2003,16)
> > quarter=rep(1:4,each=4)
> > sales=1:16
> > company=rep(c("a","b","c","d"),4)
> > df=data.frame(year,quarter,sales,company) #this is the database
> >
> > I would like to construct a cross tabulation table like this:
> > 2003 #a row of year(s)
> > 1 2 3 4 #a row of quarters of each year
> > a 1 2 3 4
> > b 5 6 7 8
> > c 9 10 11 12
> > c 13 14 15 16
> > #maybe add a row of subtotal for each quarter at the
> > end.
> >
> > I tried xtabs, but all I could produce is this, unfortunately:
> > xtabs(sales~year+quarter, data=df)
> > quarter
> > year 1 2 3 4
> > 2003 10 26 42 58
> >
> > or this:
> >
> >
> > xtabs(sales~year+quarter+company, data=df)
> > , , company = a
> >
> > quarter
> > year 1 2 3 4
> > 2003 1 5 9 13
> >
> > , , company = b
> >
> > quarter
> > year 1 2 3 4
> > 2003 2 6 10 14
> >
> > , , company = c
> >
> > quarter
> > year 1 2 3 4
> > 2003 3 7 11 15
> >
> > , , company = d
> >
> > quarter
> > year 1 2 3 4
> > 2003 4 8 12 16
> > Thanks!
> >
> > --
> > Tom
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help_at_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.
> >
>
> Charles C. Berry (858) 534-2098
> Dept of Family/Preventive
> Medicine
> E mailto:cberry_at_tajo.ucsd.edu UC San Diego
> http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901
>
>
>

-- 
Tom

	[[alternative HTML version deleted]]

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Received on Wed 23 Jan 2008 - 01:53:43 GMT

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