Re: Solving heterogeneous variance using mixed linear models

Posted by Bruce Weaver on Apr 20, 2012; 2:33pm
URL: http://spssx-discussion.165.s1.nabble.com/Solving-heterogeneous-variance-using-mixed-linear-models-tp5652270p5654365.html

For that particular model, the unequal variances t-test yields the same results.  Change to a fixed font if the following does not line up nicely.

Estimate    SE       df          t       p        Lower   Upper
-0.5126  0.0536   913.3551  -9.5676   0.0000 -0.6178 -0.4075  [1]
-0.5126  0.0536   913.3551  -9.5676   0.0000   -0.6178 -0.4075  [2]

[1] - Fixed effect test for Group from Ryan's MIXED analysis
[2] - Unequal variances t-test

For situations with more than 2 groups, I expect that the Welch or Brown-Forsythe F-tests available via ONEWAY would give the same (or very similar) results that you get with MIXED.

HTH.

jweedon wrote

Many thanks Ryan, that's just the ticket!

Jay