Hi César,
Happy New Year! Just some feedback from testing Bartlett's and Levene's test that you recently added 2.8.1. Thanks for adding those tests in so quickly!
I tested Bartlett's test against R and a propriety statistics software package and the results from Accord are identical to what the other software produced.
With regards to Levene's test I am receiving an identical statistic value but incorrect pvalue in Accord in comparison with other two softwares. I have posted this on the issue tracker along with the data used.
If you have any questions please let me know.
Cheers
Andrew