The linear model object (can be of class lm, aov, anova, or
aovlist).
effsize
Character describing the effect size to be displayed: "eta"
(default) or "omega".
partial
Logical that decides if partial eta-squared or omega-squared
are returned (Default: TRUE). If FALSE, eta-squared or omega-squared
will be returned. Valid only for objects of class lm, aov, anova, or
aovlist.
conf.level
Numeric specifying Level of confidence for the confidence
interval (Default: 0.95).
nboot
Number of bootstrap samples for confidence intervals for partial
eta-squared and omega-squared (Default: 500).