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st: RE: Robust equal variance test!Results?


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Robust equal variance test!Results?
Date   Wed, 14 Mar 2007 13:27:52 -0000

Your P-values are much less than any standard level,
so conventionally you fail to reject (or even accept)
a null hypothesis of no difference. This is true on three 
different criteria, so how you compute it is unimportant. 

In any case, the results show simply that sd is about
0.7 in both cases. 

Nick 
n.j.cox@durham.ac.uk 

Vanessa Mahlberg
 
> I?ve used the Levene Test to check up homogeneity of variance by the
> command .robvar a_kollegen, by( zugeh )
> Now I can?t interpret the results given by stata. How can I figure out
> if the variances within a group differ significantly.
> 
> robvar a_kollegen, by( zugeh )
> 
> Summary of a_kollegen
> zugeh Mean Std. Dev. Freq.
> 
> 1 4.3243243 .66431772 74
> 2 4.202381 .72444016 84
> 
> Total 4.2594937 .69740538 158
> 
> W0 = .11174352 df(1, 156) Pr > F = .73861681
> 
> W50 = .08352366 df(1, 156) Pr > F = .77296155
> 
> W10 = .07764111 df(1, 156) Pr > F = .78088894
> 
> 
> It would be very kind if somebody could give me some advice.

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