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Re: st: Add new observations.


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
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
<a_gyllenram@hotmail.com> 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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> *   http://www.ats.ucla.edu/stat/stata/

*
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