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st: RE: How to append these two data sets


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: How to append these two data sets
Date   Mon, 13 Apr 2009 14:47:09 +0100

See the help for -append-. 

Nick 
n.j.cox@durham.ac.uk 

Quang Nguyen


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
......

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