pwr2ppl (version 0.1.1)

propind: Compute power for Tests of Two Independent Proportions Takes phi, degrees of freedom, and a range of sample sizes. Alpha is .05 by default, alternative values may be entered by user

Description

Compute power for Tests of Two Independent Proportions Takes phi, degrees of freedom, and a range of sample sizes. Alpha is .05 by default, alternative values may be entered by user

Usage

propind(p1, p2, nlow, nhigh, nratio = 0.5, alpha = 0.05, tails = 2,
  by = 1)

Arguments

p1

expected proportion Group 1

p2

expected proportion Group 2

nlow

starting sample size

nhigh

ending sample size

nratio

ratio of sample size of first group to second (default is .5 for equally sized groups)

alpha

Type I error (default is .05)

tails

number of tails for test (default is 2)

by

Incremental increase in sample (e.g. nlow = 10, nhigh = 24, by = 2, produces estimates of 10, 12, and 14)

Value

Power for Tests of Two Independent Proportions

Examples

Run this code
# NOT RUN {
propind(p1=.62, p2=.55,nlow=200,nhigh=2500, by=100,nratio=.2)
# }

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