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st: Common variables in different datasets

From   Nikolaos Kanellopoulos <[email protected]>
To   "[email protected]" <[email protected]>
Subject   st: Common variables in different datasets
Date   Tue, 13 Sep 2011 15:33:09 +0100 (BST)

I have a set of data files (file1.dta, file2.dta,...,file20.dta). There are some common variables which appear in all files and some which appear only in some. I want to create an output/table where the rows will be the variable names and the columns will be the file names and the cells will indicate whether the variable appears in each file.
I am hoping to get something like this :
Variables |  file1  |  file2  |  file3  |
var1         |   x     |  x      |  x     |
var2         |          |          |  x     |
var3         |  x      |  x      |         |

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