Compute Power for a Two-Sample t-Test (Equal Sample Sizes)

This function calculates the power for a two-sample t-test when the two groups have equal sample sizes.

Usage

power_t_two_sample(d, n_per_group, alpha = 0.05, tails = "two", n2 = NULL)

Arguments

d

Numeric. The effect size (Cohen's d).

n_per_group

Integer. The sample size per group.

alpha

Numeric. The significance level (default is 0.05).

tails

Character. `"two"` for a two-tailed test or `"one"` for a one-tailed test.

n2

Optional second-group sample size. If omitted, equal group sizes are used.

Value

Numeric. The computed power (1 - beta).

Examples

# Compute power for an effect size d = 0.5 with 30 subjects per group
power_t_two_sample(d = 0.5, n_per_group = 30)
#> [1] 0.4778965