Test post: Comparability score analysis - which weight to use

[Johanna Metsälä]

I have received an example of comparability score analysis for SAS (see example below) and I need to reanalyze my data using this method. However, I am using Stata, version 12.0 for Mac, and I have never used weights, this new score method or SAS before. I have a simple logistic regression model, which I should weight by the comparability score (derived by certain criteria described in Vintzileos et al. The use of a comparability scoring system in reporting observational studies. Am J Obstet Gynecol. 2014; 210:112-116.).

Can anyone help which weight in Stata would be the correct one to use in order to do the weighting in a similar way than it is done in the SAS example?

Best regards,
Johanna
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SAS example:

DATA work.TWO;
input EXP OUT WT;

datalines;
1 1 182
1 2 478
2 1 87
2 2 319
;
run;


DATA work.TWO;
set work.TWO;

*WT is the weight from the comparability score;

IF (EXP = 1) then WT = WT;
else IF (EXP = 2) then WT = WT*6/12;

run;

PROC FREQ DATA = work.TWO;
weight WT;
table EXP*OUT / nocol nopercent cmh;
exact PCHI OR;
run;
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