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Re: st: AW: t-test using analytic weights


From   Sripal Kumar <sripalkumar@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: AW: t-test using analytic weights
Date   Tue, 10 Nov 2009 10:27:05 -0500

Correction to my prior message:

I did:

Step 1.  mean age1 age2 [aweight = wt]
Step 2   lincom (age1)-(age2) to get the t-test and probabilities
Pls let me know what you think
thanks,
Sripal.

On Tue, Nov 10, 2009 at 10:21 AM, Sripal Kumar <sripalkumar@gmail.com> wrote:
> Sorry.  I should have clarified. The reason I am using aweights are
> similar to what you said. My observations are not really observations
> but more of estimates.
>
> I figured an easier way around.  Pls let me know what you think:
>
> Step 1.  ttest age1 == age2 [aweight = wt], unpaired
> Step 2 lincom (age1)-(age2) to get the t-test and probabilities
>
> thanks,
> Sripal.
>
> On Tue, Nov 10, 2009 at 10:04 AM, Maarten buis <maartenbuis@yahoo.co.uk> wrote:
>> --- Sripal Kumar wrote:
>>> I am trying to use t-test of independent samples but by
>>> using analytic weights.  I tried the following:
>>>
>>> ttest age1 == age2 [aweight = wt], unpaired
>>>
>>> I get an error message saying "weights not allowed".
>>> Is there a way around it?
>>
>> --- On Tue, 10/11/09, Martin Weiss wrote:
>>> The archive is full of advice to try an equivalent
>>> -regress- command...
>>
>> The archive is also full of advise that aweights are almost
>> never the appropriate weight type (aweights are for the
>> very special situation where your observations aren't
>> observations but estimates and the weights are the inverse
>> of the standard error squared).
>>
>> -- Maarten
>>
>> --------------------------
>> Maarten L. Buis
>> Institut fuer Soziologie
>> Universitaet Tuebingen
>> Wilhelmstrasse 36
>> 72074 Tuebingen
>> Germany
>>
>> http://www.maartenbuis.nl
>> --------------------------
>>
>>
>>
>>
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