What would be the R formulae for a two-sided test?
I have a formula for a one-sided test:
powertest - function(a,m0,m1,n,s){
t1 = -qnorm(1-a)
num = abs(m0-m1) * sqrt(n)
t2 = num/s
pow = pnorm(t1 + t2)
}
Would you pls let me know if you know of?
Thank you,
ej
Ethan Johnsons wrote:
What would be the R formulae for a two-sided test?
I have a formula for a one-sided test:
powertest - function(a,m0,m1,n,s){
t1 = -qnorm(1-a)
num = abs(m0-m1) * sqrt(n)
t2 = num/s
pow = pnorm(t1 + t2)
}
Would you pls let me know if you know of?
Ethan Johnsons [EMAIL PROTECTED] writes:
What would be the R formulae for a two-sided test?
I have a formula for a one-sided test:
powertest - function(a,m0,m1,n,s){
t1 = -qnorm(1-a)
num = abs(m0-m1) * sqrt(n)
t2 = num/s
pow = pnorm(t1 + t2)
}
Would you pls let me know if you know
Thank you so mcuh for the explanation, Chuck Peter.
Two quick questions,please.
It states that delta = True difference in means. When the true diff
is unkown, can you use the expected diff for delta.
If you want to know the n (number of observations) off of power.t.test
to have i.e. 80%
. ~M.J.Moroney
-Oorspronkelijk bericht-
Van: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Namens Ethan Johnsons
Verzonden: vrijdag 27 oktober 2006 16:59
Aan: Peter Dalgaard
CC: r-help@stat.math.ethz.ch
Onderwerp: Re: [R] Power of test
Thank you so mcuh for the explanation, Chuck Peter.
Two
: vrijdag 27 oktober 2006 16:59
Aan: Peter Dalgaard
CC: r-help@stat.math.ethz.ch
Onderwerp: Re: [R] Power of test
Thank you so mcuh for the explanation, Chuck Peter.
Two quick questions,please.
It states that delta = True difference in means. When the true diff
is unkown, can you use
PROTECTED] [mailto:[EMAIL PROTECTED] Namens Ethan Johnsons
Verzonden: vrijdag 27 oktober 2006 16:59
Aan: Peter Dalgaard
CC: r-help@stat.math.ethz.ch
Onderwerp: Re: [R] Power of test
Thank you so mcuh for the explanation, Chuck Peter.
Two quick questions,please.
It states that delta
#.
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ethan Johnsons
Sent: Friday, October 27, 2006 4:50 PM
To: ONKELINX, Thierry
Cc: r-help@stat.math.ethz.ch; Peter Dalgaard
Subject: Re: [R] Power of test
Can I please ask a quick question again
with...
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ethan Johnsons
Sent: Friday, October 27, 2006 4:50 PM
To: ONKELINX, Thierry
Cc: r-help@stat.math.ethz.ch; Peter Dalgaard
Subject: Re: [R] Power of test
Can I please ask a quick
