Small bug (or strange behavior) in ANOVA/ANCOVA
Posted: Tue Oct 24, 2017 9:27 am
Hi
I notice a small bug in ANOVA/ANCOVA modules, (it might be intended). In Assumptions check there is the Levene test that test the equivalence of variances across groups. At the moment, it checks all groups defined by the combinations of levels in the variables put in factors. However, if one changes the model in "Model" and remove one of the factor from the model (while keeping the variable in the "factors" field), the Levene's test still consider the factor levels in the test. I guess it would be better if it tested only the combinations of groups in the model.
cheers
I notice a small bug in ANOVA/ANCOVA modules, (it might be intended). In Assumptions check there is the Levene test that test the equivalence of variances across groups. At the moment, it checks all groups defined by the combinations of levels in the variables put in factors. However, if one changes the model in "Model" and remove one of the factor from the model (while keeping the variable in the "factors" field), the Levene's test still consider the factor levels in the test. I guess it would be better if it tested only the combinations of groups in the model.
cheers