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reshape problem [was: Re: st: From: Qunzi Zhang <zhangqunzi@googlemail.com>]


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   reshape problem [was: Re: st: From: Qunzi Zhang <zhangqunzi@googlemail.com>]
Date   Thu, 1 Nov 2012 15:13:03 +0000

Your data doesn't obviously have a panel identifier, unless it is -permno-.

The command to reshape your data is called -reshape-.

Your data already seem to have the best structure for most panel
analyses. It's not clear that you will be better off reshaping.

Nick

On Thu, Nov 1, 2012 at 3:06 PM,  <owner-statalist@hsphsun2.harvard.edu> wrote:

> May I ask you a question about construction the data set?
>
> Currently I have the following panel data format
> permno    date    prc
> 27174    19700102    56.375
> 20386    19700102    34
> 12052    19700102    28.75
> 27174    19700101    56.375
> 20386    19700101    34
> 12052    19700101    28.75
>
>
>
> in Stata, how can I reshape the data and get the format as below: a
> big matrix the row is the date, column is the firm identity permno and
> input is the stock price?
>
> date          firm 1 firm2 firm3 .....(permno as identifer index for firm)
> 19700101   56.37 5.37 6.35
> 19700102  .7  .37 .35
>
>
> I think merge could be the correct command but using it might create a
> lot of dta wrt each firm.... Can you please suggest me an efficient
> way to do this?
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