I have three groups with very small sample sizes (6 obs per each group). In order to use ANOVA I just want to make sure that the equality of variances is satisfied, as Levene's test does not have very good power for small sample sizes, I was wondering what is the right criteria value for rule of thumb (checking the equality of variances/ Max variance/ min variance).
Based on the following like, if the ratio of variances is more than 3 then we can reject the equality of variances:
https://data.library.virginia.edu/a-rule-of-thumb-for-unequal-variances/
But Based on this link (Keppel's ratio rule of thumb) if the ratio of variances is more than 9 then the equality of variances should be rejected.
http://www.theanalysisfactor.com/newsletter/October-2017.html