OptionalbetweenVariance between the groups' means.
OptionalgroupsNumber of groups.
OptionalnNumber of observations per group.
OptionalpowerPower of the test.
OptionalsigSignificance level. Default 0.05.
OptionalwithinVariance within the groups.
Options for powerAnovaTest. The quantity given as
null(or omitted, for those without a default) is solved for.