Object of class "power.htest", a list of the arguments
(including the computed one) augmented with method and
note elements.
Details
Exactly one of the parameters n, p1, p2,
power, and sig.level must be passed as NULL, and that
parameter is determined from the others. Notice that sig.level
has a non-NULL default so NULL must be explicitly passed if you want
it computed.
If strict = TRUE is used, the power will include the probability of
rejection in the opposite direction of the true effect, in the two-sided
case. Without this the power will be half the significance level if the
true difference is zero.