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Re: st: Add new observations.
From
Nick Cox <[email protected]>
To
[email protected]
Subject
Re: st: Add new observations.
Date
Mon, 24 Sep 2012 11:25:24 +0100
This sounds like a case for -fillin-. See the help and
SJ-5-1 dm0011 . . . . . . . . . . . . . . Stata tip 17: Filling in the gaps
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J. Cox
Q1/05 SJ 5(1):135--136 (no commands)
tips for using fillin to fill in gaps in a rectangular
data structure
Nick
On Mon, Sep 24, 2012 at 11:13 AM, André Gyllenram
<[email protected]> wrote:
> I have information on all stocks that a number of individuals owns in a given time-period. A small part of the data looks like this:
>
>
> Individual date stock portfolioweight
> 3 2000 1 .1
> 3 2000 4 .2
> 3 2000 9 .3
> 3 2000 10 .4
> 4 2000 1 .1
> 4 2000 2 .1
> 4 2000 3 .1
> 4 2000 4 .2
> 4 2000 5 .1
> 4 2000 6 .1
> 4 2000 7 .1
> 4 2000 8 .2
> 5 2000 3 1
>
>
>
>
>
> From the data above I have created a list of all stocks that is owned by at least one individual. In this example the individuals together owns ten different stocks.
>
> Stock date
> 1 2000
> 2 2000
> 3 2000
> 4 2000
> 5 2000
> 6 2000
> 7 2000
> 8 2000
> 9 2000
> 10 2000
>
> What i want to do is that I for every individual and date would like to add the stocks that the individual do not own. Individual 3 above owns 4 stocks but I want to add 6 new rows for the stocks he does not own. I want to do the same for all other individuals. This means that I need 10 rows for every individual. I want the data to look like this:
>
>
>
>
> Individual date stock portfolioweight
> 3 2000 1 .1
> 3 2000 2 .
> 3 2000 3 .
> 3 2000 4 .4
> 3 2000 5 .
> 3 2000 6 .
> 3 2000 7 .
> 3 2000 8 .
> 3 2000 9 .3
> 3 2000 10 .4
>
>
> 4 2000 1 .1
> 4 2000 2 .1
> 4 2000 3 .1
> 4 2000 4 .2
> 4 2000 5 .1
> 4 2000 6 .1
> 4 2000 7 .1
> 4 2000 8 .2
> 4 2000 9 .
> 4 2000 10 .
>
> 5 2000 1 .
> 5 2000 2 .
> 5 2000 3 1
> 5 2000 4 .
> 5 2000 5 .
> 5 2000 6 .
> 5 2000 7 .
> 5 2000 8 .
> 5 2000 9 .
> 5 2000 10 .
>
>
> The variable portfolioweight is missing if the individual does not own the particular stock.
>
>
>
> I have tried to use merge and joinby but it does not seem to be the right way to do this. Or am I missing something?
>
>
>
> All help is appreciated.
>
>
> Kind regards
> André Gyllenram
>
>
> *
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*
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