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RE: st: another question on the interpretation of rho and atanhrho


From   "Lachenbruch, Peter" <[email protected]>
To   "[email protected]" <[email protected]>
Subject   RE: st: another question on the interpretation of rho and atanhrho
Date   Tue, 8 May 2012 11:21:55 -0700

sorry - I missed that

________________________________________
From: [email protected] [[email protected]] On Behalf Of Nick Cox [[email protected]]
Sent: Tuesday, May 08, 2012 11:20 AM
To: [email protected]
Subject: Re: st: another question on the interpretation of rho and atanhrho

I don't think so. Hyperbolic functions are not trigonometric functions!

To a very good approximation tanh x ~ x for small x.

For the Mickey Mouse tutorial, see

SJ-8-3  pr0041  .  Speaking Stata: Corr. with confidence, Fisher's z revisited
        (help corrci, corrcii if installed) . . . . . . . . . . . .  N. J. Cox
        Q3/08   SJ 8(3):413--439
        reviews Fisher's z transformation and its inverse, the
        hyperbolic tangent, and reviews their use in inference
        with correlations

Nick

On Tue, May 8, 2012 at 7:12 PM, Lachenbruch, Peter
<[email protected]> wrote:

> is it possible that we have a radian vs. degree question here?  I make that blunder all the time.

David Roodman ([email protected]) [[email protected]]

> -0.244 is not tanh(-2.489), so there must be something wrong with this example.
> Stipulating a 10% significance level, 2 is more correct.

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