Levene's test of equality of variances

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jantonie
Posts: 22
Joined: Tue Oct 17, 2017 11:58 am

Levene's test of equality of variances

Post by jantonie »

Hello,

Jamovi is a very intuitive software. Thank you so much. It allows, among other things, to test the equality of the variances using the Levene's test (independent samples T Test). The statistic of this test is a Fisher's F and I propose that you add in the output the second degrees of freedom corresponding to the sample size less the number of groups (as it is done for the same test of Levene but in the one-way anova menu).

A thousand thanks in advance

Jantonie
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jonathon
Posts: 2613
Joined: Fri Jan 27, 2017 10:04 am

Re: Levene's test of equality of variances

Post by jonathon »

hey jantonie,

i've added this now, and it will be in the next release (0.9.6.6)

with thanks

jonathon
vmoreno
Posts: 21
Joined: Mon Jun 05, 2017 6:04 pm

Re: Levene's test of equality of variances

Post by vmoreno »

Hi,
I know that Levene's test is less sensitive than Bartlett's test to deviations of normality.
However, it would be useful to have both tests performed. I have a data scenario in which doubling the variance in one group vs the other, Levene's p = 0.36 while Bartlett or the result of var.test (2 groups) p = 0.0088.
These data are skewed, but with relatively large sample size, and Levene's test is not useful to advise the use of Welch's correction for t-test.

Thanks

Victor
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