Hi,
comparing ten portfolios of returns using -oneway- , Bartlett's test for
equal variances always highly rejects the null hypothesis.
1.) What routines can be used in Stata if the assumptions of ANOVA are
violated?
2.) Generally speaking, does the violation of ANOVA assumption shift the
F-test to more conservative results (i.e. tends not to reject H0 of
equality)?
I am aware that nonparametric tests like the Kruskal-Wallis test ( -kwallis-
, -kwallis2- ) can help with settings where the normality assumption of the
ANOVA is violated, but it still assumes equal variance.
Thanks for your feedback.
Tom
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