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

[Gabor Grothendieck]

I think you are looking for ftable:

xt <- xtabs(sales ~ company + year + quarter, data = DF)
ftable(quarter ~ year + company, xt)

You also might want to look at the reshape package and
the rpad package.  Here is a demo of a pivot table in R using
rpad for the user interface and reshape for the data manipulation
that includes drag and drop:
http://www.rpad.org/Rpad/DataExplorer.Rpad

On Jan 22, 2008 8:19 PM, tom soyer <tom.soyer at gmail.com> 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?
>
> 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]]
>
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