differences: A function that takes two means, sd's, n's and gives lower...

In samuelfranssens/rlibrary: library with functions that I often use

Description

This function will give you a confidence interval around a difference and its associated cohen's d

Usage

differences(mean1, mean2, sd1, sd2, n1, n2, alpha = 0.95)

Arguments

mean1	mean 1
mean2	mean 2
sd1	sd 1
sd2	sd 2
n1	sample size 1
n2	sample size 2
alpha	alpha level

Details

formula for d = (mu1 - mu2) / sigma where sigma = sqrt ( a / b ) = pooled standard deviation where a = (n-1) x s1 x s1 + (n-2) x s2 x s2 where b = n1 + n2 - 2

also: t = ( mean(x1) - mean(x2) ) / (sigma * sqrt(1/n1 + 1/n2)) so t = d * 1 / sqrt(1/n1 + 1/n2) so d = t * sqrt(1/n1 + 1/n2)

Examples

differences(mean1, mean2, sd1, sd2, n1, n2)

samuelfranssens/rlibrary documentation built on Nov. 30, 2021, 2:46 a.m.