R - Levene test for variances

Instructional video on how to perform a Levene test for variances (homogeneity of variance) with R (using the car package).

[sean]

Thank you. This was very clear and very useful for a beginner learning R statistics.

[scrie]

Clear and consise. Thank you very much! Jammer van Rotterdam :(

[agustinjimenez]

No hablo inglés y no entiendo nada de programación, sin embargo entendí toda tu explicación te felicito. Tienes buena didáctica.

[Calaf]

it was useful for me, thanks, it was really easy to understand. I am going to teach it to my students.

[rentapia_boy]

Thanks for the explanation I saw you understand Spanish so... muchas gracias por tu video :)

[essabatel]

Shouldn't the Levene's test be performed on the residuals? How I understand it is like this
LeveneTest (residuals(model) ~ between-subject factor, data= dataframe)
Unless the LeveneTest function extracts the residuals automatically as a default step.
So, please correct me if I am wrong.

[ProfBoggs]

Does Zimmerman provide an explanation for why we should never use Levene's test? Does he recommend a different one?


In any case, thanks for illustrating the use of this command.

[sushantkarki]

what is that ticking sound. it's driving me nuts

[FadeelaT]

Why shouldn't Levene's test be used?

[TERTTZ]

I'm fairly new to R but what does the error "Error in leveneTest.default (data) is not a numeric variable" mean? Sorry if this is a dumb question.

[Skandawin]

So how do we interpret these results? My understanding is to establish that there is no big difference in variance of different groups ( establish homogeneity of variance) so if the p - value is significant does it mean the groups have homogeneous variance( which is desired) or heterogeneous variance?
in other words what is the null and alternate hypothesis of these 2 tests?

[АлександрБолбат-ыу]

I am confused. The p-value is less than 0.05 which usually means there is no reason to assume the alternative hypothesis. The null hypothesis for Levene's test is that variances are homogeneous. Am I missing something?

[samuelfinnerty]

Excellent, thanks for this. If you're doing a test retest of a scale (with same participants completing scales a month apart) is it acceptable to do a levene test with scale score and time as a factor (time one and time two)?

[eritrean_forever]

Just to be sure, so here in this video with a significance of 0.05, variances are not homogenous right?

[treemo]

mine says leveneTest. default : group coerced to factor

[niru]

what if I have two independent variables? How do you do the levene test?

[claire]

hm, the levene test in r doesn't seem to work anymore?