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Re: st: calculating differences in variables in Longitudinal Data
From
Abhimanyu Arora <[email protected]>
To
[email protected]
Subject
Re: st: calculating differences in variables in Longitudinal Data
Date
Mon, 9 Apr 2012 21:36:08 +0200
Hi
I would do it as follows
tsset year
forvalues i=1/54{
gen diff`i'=.
bys company:replace diff`i'=S2.var`i' if year==2011
}
Cheers
Abhimanyu
On Mon, Apr 9, 2012 at 9:23 PM, Alexander Zoran Dozet <[email protected]> wrote:
>
> Dear Statausers,
>
> I have a small problem
> that I suppose is easy to resolve if one knows the ansewer. Although it
> probably is basic, I have tried to solve it by searching the internet
> and hitting the books, I have not succeded in finding an answer.
>
> I have a dataset that looks like this:
>
>
> Company Year Variable1 Variable2 Variable3.........Variable54
>
> Company1 2009 60 70 80
> Company1 2010 65 72 81
>
> Company1 2011 67 71 85
>
> Company2 2009 85 80 70
>
> Company2 2010 75 85 78
>
> Company2 2011 77 88 76
>
> .
> .
> .
> Company154
>
>
> I hope the displayed data structure is kept in this e-mail.
> Each company is occuring one time each year for each variable in the data
> set (panel data). My variable Company is in string form. I have not
> declared my dataset to be panel data. String is not allowed as an
> identifier.
>
> I want to examine the difference between the
> year 2010 and 2011 for each company and for each variable and to create a new variable for each of the differences for
> example diffVar1, diffVar2,....
>
> I would be much grateful for any help!
>
> Best regards and cheers
> Alexander Dozet
>
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