[R] panel data

[Gabor Grothendieck]

Try this:

> as.data.frame.table(tapply(DF[,3], DF[2:1], c), responseName = names(DF)[3])
   YEAR     ID HEIGHT
1  2007  Harry     62
2  2008  Harry     62
3  2007   Jack     70
4  2008   Jack     NA
5  2007  James     68
6  2008  James     NA
7  2007 Jordan     NA
8  2008 Jordan     72
9  2007   Mary     45
10 2008   Mary     50
11 2007    Tom     65
12 2008    Tom     66



On Fri, Apr 2, 2010 at 3:39 PM, Geoffrey Smith <gps at asu.edu> wrote:
> Hello, I have an unbalanced panel data set that looks like:
>
> ID,YEAR,HEIGHT
> Tom,2007,65
> Tom,2008,66
> Mary,2007,45
> Mary,2008,50
> Harry,2007,62
> Harry,2008,62
> James,2007,68
> Jack,2007,70
> Jordan,2008,72
>
> That is, James, Jack, and Jordan are missing a YEAR.
>
> Is there any command that will "fill in" the missing YEAR such that the end
> result will be balanced and look like:
>
> ID,YEAR,HEIGHT
> Tom,2007,65
> Tom,2008,66
> Mary,2007,45
> Mary,2008,50
> Harry,2007,62
> Harry,2008,62
> James,2007,68
> James,2008,NA
> Jack,2007,70
> Jack,2008,NA
> Jordan,2007,NA
> Jordan,2008,72
>
> Thank you.  Geoff
>
> --
> Geoffrey Smith
> Visiting Assistant Professor
> Department of Finance
> W. P. Carey School of Business
> Arizona State University
>
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>
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