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1998 Feb 22
0
R-beta: t.test in R
...) {
df <- nx + ny - 2
v <- ((nx - 1) * vx + (ny - 1) * vy)/df
stderr <- sqrt(v * (1/nx + 1/ny))
tstat <- (mx - my - mu)/stderr
}
else {
stderrx <- sqrt(vx/nx)
stderry <- sqrt(vy/ny)
stderr <- sqrt(stderrx^2 + stderry^2)
df <- stderr^4/(stderrx^4/(nx - 1) +
stderry^4/(ny - 1))
tstat <- (mx - my - mu...
2004 Nov 24
3
T-test syntax question
Hi.
I'd like to do a t-test to compare the Delta values of items with Crit=1
with Delta values of items with Crit=0. What is the t.test syntax?
It should produce a result like this below (I can't get in touch with the
person who originally did this for me)
Welch Two Sample t-test
data: t1$Delta by Crit
t = -3.4105, df = 8.674, p-value = 0.008173 alternative hypothesis: true