tdf: Compute degrees of freedom for a 2-sample t-test

In rpruim/fastR2: Foundations and Applications of Statistics Using R (2nd Edition)

Compute degrees of freedom for a 2-sample t-test

Description

This function computes degrees of freedom for a 2-sample t-test from the standard deviations and sample sizes of the two samples.

Usage

tdf(sd1, sd2, n1, n2)

Arguments

sd1	standard deviation of the sample 1
sd2	standard deviation of the sample 2
n1	size of sample 1
n2	size of sample 2

Value

estimated degrees of freedom for 2-sample t-test

Examples

data(KidsFeet, package="mosaicData")
fs <- favstats( length ~ sex, data=KidsFeet ); fs
t.test( length ~ sex, data=KidsFeet )
tdf( fs[1,'sd'], fs[2,'sd'], fs[1,'n'], fs[2,'n'])

rpruim/fastR2 documentation built on Nov. 11, 2023, 7:32 a.m.