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RE: st: functions for computing prob


From   "Lei Xuan" <leix@martingale-research.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: functions for computing prob
Date   Wed, 22 Mar 2006 12:56:49 -0600

Thanks a lot, Gary!

Lei

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Gary Longton
Sent: Wednesday, March 22, 2006 12:47 PM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: functions for computing prob

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 I want to know if the functions -tprob- and -normprob- are out-of-date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 is out of date, no longer documented, and has been replaced by 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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