Optionalalternative"two.sided" (default) or "one.sided".
OptionaldeltaTrue difference in means.
OptionalnNumber of observations (per group).
OptionalpowerPower of the test.
OptionalsdStandard deviation. Default 1.
OptionalsigSignificance level. Default 0.05.
OptionalstrictTwo-sided: count the probability of rejecting in the wrong direction too. Default false.
OptionaltolTolerance of the root finding. Default eps^0.25.
Optionaltype"two.sample" (default), "one.sample" or "paired".
Options for powerTTest. The quantity given as
null(or omitted, for those without a default) is solved for.