min_sample_size: Calculate minimum required sample size

In IyarLin/hype: Variuos functions for proportions difference hypothesis testing

Description

this function calculates the minimum required sample size (equal for both treatment groups) which acheives a desired MDE and power provided alpha, s, h and gamma.

Usage

min_sample_size(mde, p_0, alpha, s, h, gamma, power)

Arguments

mde	minimum detectable effect
p_0	assumed population 0 p parameter
alpha	test significance level
s	either 1 (for one sided test) or 2 (for two sided test)
h	number of hypothesis tested in the same experiment (for Bonferroni correction)
gamma	minimum required lift
power	desired test power (inverse of type 2 error)

Details

In 2 sided tests each usually represents a different treatment. When doing one-sided tests it's usually the case that population 1 is considered the treatment and population 0 serves as the control. At any rate, one sided tests are always of the form p_1 - p_0 > C. For that reason for 1 sided tests one must set: mde > gamma >= 0

Value

minimum requires sample size per treatment group

Examples

library(hype)

# For a thorugh simulation validation see
# https://github.com/IyarLin/hype/blob/master/inst/variuos_results_for_hypothesis_testing.pdf

# below we'll calculate minimum requires sample size per group
# for 2 hypothesis tests performed
# in the same experiemnt
# note that h is set to 2 in order to reflect that

## hypothesis test number 1
min_sample_size(
  mde = 0.025, p_0 = 0.2,
  alpha = 0.05, s = 1, h = 2, gamma = 0.01,
  power = 0.8
)

## hypothesis test number 2
min_sample_size(
  mde = 0.018, p_0 = 0.1,
  alpha = 0.05, s = 2, h = 2, gamma = 0,
  power = 0.8
)

IyarLin/hype documentation built on July 20, 2020, 4:07 p.m.