n_2t_equal: Calculate Per-Group Sample Size for Two-Sample Equal Variance...

In dvmisc: Convenience Functions, Moving Window Statistics, and Graphics

Description

Same idea as power.t.test. Less flexible, but faster.

Usage

n_2t_equal(d, sigsq, alpha = 0.05, beta = 0.2)

Arguments

d	Numeric value specifying true difference in group means.
sigsq	Numeric value specifying the variance of observations.
alpha	Numeric value specifying type-1 error rate.
beta	Numeric value specifying type-2 error rate.

Value

Numeric value indicating per-group sample size, rounded up to the nearest whole number.

Examples

# Per-group sample size for 90% power to detect difference of 0.2 with
# sigsq = 1
n_2t_equal(d = 0.2, sigsq = 1, beta = 0.1)

dvmisc documentation built on Dec. 18, 2019, 1:35 a.m.