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st: matching procedure


From   "Richter, Ansgar" <Ansgar.Richter@ebs.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: matching procedure
Date   Wed, 7 May 2008 09:00:35 +0200

Dear Statalist users,

 

I have a question regarding statistical matching of two samples. My problem is as follows:

Research design: Two samples (A, B) with 180 individual respondents each.  Same 16 questions were asked for 4 different project settings (equals 64 variables).  In each project setting, Sample A respondents answered 8 of the questions, the other 8 questions were answered by B respondents.

The problem is that each observation has always 32 missing values. Example of data structure for questions 6-11 in project setting 1 for respondents 351-355

351. |        .          .          .          2          6          4 |
352. |        3          6          7          .          .          . |
353. |        .          .          .          5          5          4 |
354. |        .          .          .          2          4          7 |
355. |        6          6          6          .          .          . |

Objective: Match A and B respondents to have all 16 questions for each project setting answered per observation resulting in a sample size of 180 paired respondents (necessary for ANOVA).  Respondents are supposed to be matched (paired) based on demographic variables which were answered by each respondent.

I tried psmatch2 in Stata but it seems that I can't use this function for this design. Do you have any suggestions as to how I could achieve the matching that I envisage?

Thank you very much for your help.

Ansgar
       

 

Ansgar Richter

European Business School (EBS)

 



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