Sample size and power of test

`sampsizepwr`

computes the sample
size, power, or alternative parameter value for a hypothesis test,
given the other two values. For example, you can compute the sample
size required to obtain a particular power for a hypothesis test,
given the parameter value of the alternative hypothesis.

returns
the sample size, `nout`

= sampsizepwr(`testtype`

,`p0`

,`p1`

)`nout`

, required for a two-sided
test of the type specified by `testtype`

to have
a power (probability of rejecting the null hypothesis when the alternative
hypothesis is true) of 0.90 when the significance level (probability
of rejecting the null hypothesis when the null hypothesis is true)
is 0.05. `p0`

specifies parameter values under
the null hypothesis. `p1`

specifies the value,
or an array of values, of the single parameter being tested under
the alternative hypothesis.

`___ = sampsizepwr(`

returns
any of the previous arguments using one or more name-value pair arguments.
For example, you can change the significance level of the test, or
specify a right- or left-tailed test. The name-value pairs can appear
in any order but must begin in the sixth argument position.`testtype`

,`p0`

,`p1`

,`pwr`

,`n`

,`Name,Value`

)

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