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Re: st: functions for computing prob


From   Gary Longton <glongton@fhcrc.org>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: functions for computing prob
Date   Wed, 22 Mar 2006 10:47:10 -0800

It appears that I was mistaken about -tprob()-, that it does exist and appear to work, though undocumented and apparently obsolete. It looks to be the 2-tailed version of -ttail()-

. di tprob(30,1.8)
.08192507

. di ttail(30,1.8)
.04096253

- GL


Gary Longton wrote:

Lei Xuan wrote:

I am computing probabilities for t-test and z-test.
I want to know if the functions -tprob- and -normprob- are out-of-date
since no help files explain these functions. Are -ttail(n,t)- and -normal(z)

right functions to compute probs?

see -help density functions-
or -help functions-

Yes, the cumulative normal density function, normprob(), still works but is out of date, no longer documented, and has been replaced by normal(). Am not sure whether tprob() ever existed? - doesn't seem to work and is not documented in any case. ttail(n,t) is documented under help for functions.

- Gary
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