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Re: st: How to append these two data sets


From   Quang Nguyen <quangn@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: How to append these two data sets
Date   Mon, 13 Apr 2009 04:20:31 -1000

Thanks Nick and Martin. Actually, the question is a bit trickier than
"append" can handle. The structure of data 1 and 2 are different,
thus, the append would result in all missing values for the mitsmatch
variables.  Thus,

append using data2

will result in all missing values for x, y, z in the combined data set.


Actually, I would like to have  the combined data as follows:

Combined data:

id     x       y              z                  v
1     4       a               7                missing
1     4       b               8                missing
1     4       c               9                missing
1     4     missing     missing            4
1     4    missing      missing            2



Given:

Data 1
id          v
1           4
1           2
2           6
2           7
 -------------

 Data 2:
id     x     y           z
1     4      a          7
1     4      b          8
1     4      c          9
2     6     a           7
2     6     b           8
2     6     c           9




On Mon, Apr 13, 2009 at 3:43 AM, Quang Nguyen <quangn@gmail.com> wrote:
> Dear All:
>
> Suppose I have the 2 following data set1:
>
> Data 1
> id          v
> 1           4
> 1           2
> 2           6
> 2           7
> -------------
>
> Data 2:
> id     x     y           z
> 1     4      a          7
> 1     4      b          8
> 1     4      c          9
> 2     6     a           7
> 2     6     b           8
> 2     6     c           9
>
>
> Note that _x_ is a fixed effect in data 2 as well as the combined data
> set. Given that,  do you know how I can append data 1 to data 2 so
> that the combined data set will have infor from both data 1 and 2 and
> some missing values due to mismatch between v and (y,z). Specifically,
> the combined data for the first observation looks like the following:
>
> Combined data:
>
> id     x    y           z          v
> 1     4     a           7        mis
> 1     4     b           8        mis
> 1     4     c           9        mis
> 1     4   mis       mis      4
> 1     4   mis       mis      2
> ......
>
>
> Many thanks!
>
>
>
> --
> "My father gave me the greatest gift anyone could give another person,
> he believed in me." - Jim Valvano
>
>
>
> --
> "My father gave me the greatest gift anyone could give another person,
> he believed in me." - Jim Valvano
>
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
>



-- 
"My father gave me the greatest gift anyone could give another person,
he believed in me." - Jim Valvano

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
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