[R] Beginner's question about t.test()
Peter Dalgaard
p.dalgaard at biostat.ku.dk
Sat Feb 14 19:54:08 CET 2004
"Pramote Khuwijitjaru" <kmote at hotmail.com> writes:
> Dear All,
> I am doing some exercise in statistics textbook on comparison of two
> experimental means. Is it possible to use t.test() do t-test when I
> have only two means, sample size, two standard deviations ? (no raw
> data).
Only if you "cheat".
fake.data <- function(n,mu,sigma) mu + sigma*scale(rnorm(n))
x1 <- fake.data(20, 12.345, .678)
x2 <- fake.data(20, 13.456, .789)
mean(x1)
sd(x1)
mean(x2)
sd(x2)
t.test(x1,x2)
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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