bf_test {miceafter} | R Documentation |
bf_test
Calculates the Brown-Forsythe test for homogeneity
of variance across groups, coefficients, variance-covariance matrix,
and degrees of freedom.
bf_test(y, x, formula, data)
y |
numeric response variable. |
x |
categorical variable. |
formula |
A formula object to specify the model as normally used by glm. Use 'factor' to define the grouping variable. |
data |
An objects of class |
The Levene's test centers around means to calculate outcome residuals, the Brown-Forsythe test around the median.
An object containing:
fstats
F-test value, including numerator and
denominator degrees of freedom.
qhat
pooled coefficients from fit.
vcov
variance-covariance matrix.
dfcom
degrees of freedom obtained from df.residual
.
Martijn Heymans, 2021
imp_dat <- df2milist(lbpmilr, impvar="Impnr")
ra <- with(imp_dat, expr=bf_test(Pain ~ factor(Carrying)))