Determines the sample size needed to achieve specified power.
Usage
sample_size_t_test(
power = 0.8,
delta,
sd,
alpha = 0.05,
alternative = c("two.sided", "less", "greater")
)
Arguments
- power
Desired power (default 0.80)
- delta
True difference from null value
- sd
Standard deviation
- alpha
Significance level (default 0.05)
- alternative
Alternative hypothesis
Value
Required sample size (integer)
Examples
# Sample size needed for 80% power to detect effect of 0.5 SD
sample_size_t_test(power = 0.80, delta = 0.5, sd = 1)
#> [1] 34