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st: Assigning new values to group variables


From   "Florian Seliger" <florian.seliger@gmx.de>
To   statalist@hsphsun2.harvard.edu
Subject   st: Assigning new values to group variables
Date   Mon, 09 May 2011 13:35:19 +0200

Dear Stalalist,

I have a dataset from a firm survey containing several thousand observations.

There are six variables with company names (Var1-Var6) where firms are asked to indicate to which other firms they have relationships.

Similar companies may occur within Var1-Var6. These are grouped as indicated by the variables group1-group6.

Var2-Var6 contain many missing values because many firms answer to have only a relationship to a single firm.

 The variables group1-group6 have different numbers although the companies are the same in var1 and var2 (and var3…), e.g., group1 may take on value 2 whereas group2 takes on value 1 for the same company. The problem is that there may also occur other companies in var2-var6 than in var1.

Please see the example below for a few companies.

 

Group1          Var1                       Group2          Var2

1                     companyABC            1                  companyABD

1                     companyABC            .                       .

2                     companyABD            .                       .

3                     companyABE            .                       .

4                     companyABF            2                  companyCCC

5                     companyACF            3                  companyDDD

6                     companyACG            .                       .          

6                     companyACG            4                  companyADK

7                     companyADK            .                       .

8                     companyADL            5                  companyCCD

8                     companyADL            .                       .

 

At the end, all similar companies across Var1-Var6 should have the same value as in group1. In addition, companies that do not occur in Var1 should be assigned another number. Please look below for an example.

 

 

Group1          Var1                        Group2          Var2

1                     companyABC            1                     .

1                     companyABC            1                     .

2                     companyABD            2                   companyABD

3                     companyABE            3                     .

4                     companyABF            4                     .

5                     companyACF            5                     .

6                     compaynACG            6                     .

6                     companyACG            6                     .

7                     companyADK            7                   companyADK

8                     companyADL            8                     .

8                     companyADL            8                     .

9                     .                     9                   companyCCC

10                   .                      10                  companyDDD

11                   .                      11                  companyCCD

 

As I did not find the right approach to assign new numbers with STATA if a company does not occur in var1, I would like to ask you if you have any ideas.

 

Thank you.

 

Best,

Florian 
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