leveneTest  R Documentation 
Computes Levene's test for homogeneity of variance across groups.
leveneTest(y, ...)
## S3 method for class 'formula'
leveneTest(y, data, ...)
## S3 method for class 'lm'
leveneTest(y, ...)
## Default S3 method:
leveneTest(y, group, center=median, ...)
y 
response variable for the default method, or a 
group 
factor defining groups. 
center 
The name of a function to compute the center of each group;

data 
a data frame for evaluating the 
... 
arguments to be passed down, e.g., 
returns an object meant to be printed showing the results of the test.
adapted from a response posted by Brian Ripley to the rhelp email list.
John Fox jfox@mcmaster.ca; original generic version contributed by Derek Ogle
Fox, J. (2016) Applied Regression Analysis and Generalized Linear Models, Third Edition. Sage.
Fox, J. and Weisberg, S. (2019) An R Companion to Applied Regression, Third Edition, Sage.
with(Moore, leveneTest(conformity, fcategory))
with(Moore, leveneTest(conformity, interaction(fcategory, partner.status)))
leveneTest(conformity ~ fcategory*partner.status, data=Moore)
leveneTest(lm(conformity ~ fcategory*partner.status, data=Moore))
leveneTest(conformity ~ fcategory*partner.status, data=Moore, center=mean)
leveneTest(conformity ~ fcategory*partner.status, data=Moore, center=mean, trim=0.1)
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