st: RE: Test for the difference between two ratios

["Scholes, Shaun" <s.scholes@ucl.ac.uk>]

Marcos, try avoid using if when using svy commands for subpopulations. Instead you should use the over command: e.g

svy:ratio x/y,over(gender)

Having done that it appears as though you can use the lincom command to test the difference between the two ratios. 

An excellent example using lincom after svy:mean can be found in the STATA manual for survey data: section "svy postestimation". 

Hope this helps
Shaun


















-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Marcos Sanches
Sent: 25 October 2011 14:15
To: statalist@hsphsun2.harvard.edu
Subject: st: Test for the difference between two ratios

Hi all,

This might be a simple question but I did not manage to find the answer to it. I have two variables, say X and Y, so I calculated the
ratio:

svy: ratio x/y
svy: ratio x/y if gender ==1
svy: ratio x/y if gender ==2

Now, what I want to do is to test whether this ratio is the same for, say, males and females. I would be grateful if someone could shed some light on how to do this..

Thanks a lot!

Marcos
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