Rebecca,
That sd is returned in r(sd_b).
Generally, you can list all returned elements by the command -return list-
then pick out the one you want.
Tom
----- Original Message -----
From: "Rebecca Thornton" <[email protected]>
To: <[email protected]>
Sent: Monday, November 10, 2003 6:49 PM
Subject: st: loneway - comparing SD's
> I'm trying to compare the estimated SD of "between" and "within" variances
> for two groups, a treatment group and a comparison group. Is there a
> suggested way to recover the standard errors in order to test the
> hypothesis that (estimated SD between effect Treatment group) = (estimated
> SD between effect Comparison group) ?
>
> For example:
> The output from loneway for the treatment group is:
>
> loneway score00nm schid if std==6 & teso==0 & male==0 & treat==1
>
> One-way Analysis of Variance for score00nm:
>
> Number of obs = 345
> R-squared = 0.5995
>
> Source SS df MS F Prob > F
> -------------------------------------------------------------------------
> Between schid 160.00569 30 5.3335229 15.67 0.0000
> Within schid 106.89158 314 .34041906
> -------------------------------------------------------------------------
> Total 266.89727 344 .77586416
>
> Intraclass Asy.
> correlation S.E. [95% Conf. Interval]
> ------------------------------------------------
> 0.57069 0.07739 0.41900 0.72238
>
> Estimated SD of schid effect .6727015
> Estimated SD within schid .5834544
> Est. reliability of a schid mean 0.93617
> (evaluated at n=11.03)
>
>
> and for the comparison group is :
>
> loneway score00nm schid if std==6 & teso==0 & male==0 & treat==0
>
> One-way Analysis of Variance for score00nm:
>
> Number of obs = 404
> R-squared = 0.5171
>
> Source SS df MS F Prob > F
> -------------------------------------------------------------------------
> Between schid 169.09683 33 5.1241465 12.01 0.0000
> Within schid 157.89682 370 .42674816
> -------------------------------------------------------------------------
> Total 326.99365 403 .81139864
>
> Intraclass Asy.
> correlation S.E. [95% Conf. Interval]
> ------------------------------------------------
> 0.48329 0.07764 0.33111 0.63546
>
> Estimated SD of schid effect .6317745
> Estimated SD within schid .6532596
> Est. reliability of a schid mean 0.91672
> (evaluated at n=11.77)
>
>
> I want to test that hypothesis that 0.6727 = 0.63177
>
>
> but don't know how to recover the standard errors.
>
>
> Thanks,
>
>
>
> Rebecca
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
*
* For searches and help try:
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* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
