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# Re: st: RE: Test for the difference between two ratios

 From Marcos Sanches To statalist@hsphsun2.harvard.edu Subject Re: st: RE: Test for the difference between two ratios Date Tue, 25 Oct 2011 23:03:34 -0400

```Thanks a lot Shaun, I was able to use lincom to solve my problem, it
worked perfectly!

Marcos

On Tue, Oct 25, 2011 at 9:38 AM, Scholes, Shaun <s.scholes@ucl.ac.uk> wrote:
>>
>> 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
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>> -----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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>

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```