SPOT (version 2.11.10)

getPower: getPower

Description

Implements basic power calculations in R See also: https://www.cyclismo.org/tutorial/R/power.html

Usage

getPower(mu0, mu1, n, sigma, alpha, tdist = FALSE, alternative = "greater")

Arguments

mu0

mean value of the null hypothesis (usually referred to as H0)

mu1

mean value of the alternative hypothesis (usually referred to as H1)

n

sample size

sigma

sample s.d.

alpha

error

tdist

logical. Use Student t Distribution. Default: FALSE

alternative

a character string specifying the alternative hypothesis, must be one of "two.sided", "greater" (default) or "less".

Examples

# NOT RUN {
## Power should be approx. 0.9183621:
getPower(mu0=5, mu1=6.5, n=20, sigma=2, alpha=0.05, tdist = FALSE, 
alternative = "two.sided")
## Power should be approx. 0.8887417:
getPower(mu0=5, mu1=6.5, n=20, sigma=2, alpha=0.05, tdist = TRUE, 
alternative = "two.sided")
## Compare with results from power.t.test
powerVal <- power.t.test(n=20, delta=1.5, sd=2, sig.level=0.05, type="one.sample",
alternative="two.sided",strict = TRUE)
powerVal$power

# }