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st: RE: Inverse hyperbolic sine function


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Inverse hyperbolic sine function
Date   Thu, 31 Mar 2005 18:12:13 +0100

This beast is also known as 

	arcsinh()
	arsinh()
	asinh() 

the first usage now being deprecated. Among 
similar functions, Stata 
appears only to support its cousin, atanh(), 
one good reason being that it is easy enough 
to knit your own. 

Nick 
n.j.cox@durham.ac.uk 

smerryman@kc.rr.com
 
> First, as Roger noted, there was a typo in my reply.  The 
> function should be
> 
> IHS = log(z + sqrt(z^2 + 1))
> 
> 
> 1.  Yes, but more generally, the ihs fuctions is ln(theta*z + 
> sqrt((theta^2 * z^2
>  + 1))/theta; where theta is scale parameter that could be estimated.
> 

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