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Re: st: RE: stat question re.: z


From   "b. water" <barleywater@hotmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: stat question re.: z
Date   Fri, 20 Jun 2003 16:03:34 +0000

Thank you to Ted and Alan for their replies. Alan was spot on, I found 'invnorm' and read more about it using help invnorm in Stata.

Alan, this expression was part of the equation for working out sample size for comparative studies in medical testing. I located Z the old fashion way by looking up textbook table but since I am a Stata user, thought I should learn how to do it in Stata.

Cheers,
bw



From: "FEIVESON, ALAN H. (AL) (JSC-SK) (NASA)" <alan.h.feiveson@nasa.gov>
Reply-To: statalist@hsphsun2.harvard.edu
To: "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject: st: RE: stat question re.: z
Date: Thu, 19 Jun 2003 15:28:16 -0500

bw - I think what you mean is ((invnorm(0.9) + invnorm(0.975))/log(1.2))^2

but what is this supposed to give you?





Al Feiveson


-----Original Message-----
From: b. water [mailto:barleywater@hotmail.com]
Sent: Thursday, June 19, 2003 1:25 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: stat question re.: z


dear all,

i would appreciate help and advise on this matter. i want to calculate
((Z^0.9 + Z^0.975)/log 1.2)^2. how can i do this in stata? i tried to search

stata and references for usage of Z but no such luck. thank you all for your

advise and help.

kind regards,
bw

ps: sorry if this reveals my ignorance

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