tdf | R Documentation |
This function computes degrees of freedom for a 2-sample t-test from the standard deviations and sample sizes of the two samples.
tdf(sd1, sd2, n1, n2)
sd1 |
standard deviation of the sample 1 |
sd2 |
standard deviation of the sample 2 |
n1 |
size of sample 1 |
n2 |
size of sample 2 |
estimated degrees of freedom for 2-sample t-test
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'])
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