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

["Lachenbruch, Peter" <Peter.Lachenbruch@oregonstate.edu>]

sorry - I missed that

________________________________________
From: owner-statalist@hsphsun2.harvard.edu [owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox [njcoxstata@gmail.com]
Sent: Tuesday, May 08, 2012 11:20 AM
To: statalist@hsphsun2.harvard.edu
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
<Peter.Lachenbruch@oregonstate.edu> wrote:

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

David Roodman (droodman@cgdev.org) [DRoodman@cgdev.org]

> -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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