hovBF

From HH v3.1-5 by Richard Heiberger

Homogeneity of Variance: Brown--Forsyth method

Keywords: dplot

Usage

hovBF(x, data = sys.parent(), ...)
hovplotBF(x, data, ..., main = "Brown-Forsyth Homogeneity of Variance", plotmath = TRUE)

Arguments

x: Model formula with one response variable and one factor.
data: data.frame
...: Other arguments. hovplotBF sends them on to the panel function. hovBF ignores them.
main: main title for the plot.
plotmath: Logical. When TRUE (the default) the strip labels use plotmath. When FALSE the strip labels use ASCII.

Value

hovplotBF returns a three-panel trellis object. hovBF returns an htest object.

References

Brown, M.~B. and Forsyth, A.~B. (1974). ``Robust tests for equality of variances.'' Journal of the American Statistical Association, 69:364--367.

Examples

data(batch)
batch1.aov <- aov(Calcium ~ Batch, data=batch)
anova(batch1.aov)
hovBF(Calcium ~ Batch, data=batch)
hovplotBF(Calcium ~ Batch, data=batch)

Documentation reproduced from package HH, version 3.1-5, License: GPL (>= 2)

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