Stata The Stata listserver
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

Re: st: Inverse hyperbolic sine function

From   Ricardo Ovaldia <[email protected]>
To   [email protected]
Subject   Re: st: Inverse hyperbolic sine function
Date   Thu, 31 Mar 2005 09:22:51 -0800 (PST)

--- [email protected] wrote:
> 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.

Is IHS = log(z + sqrt(z^2 + 1)) then only an
approximation? If so, I assume that it is good when z
is large relative to 1/theta. But how can we know
ahead of time how good the approximation will be on
our data?


Do you Yahoo!? 
Yahoo! Mail - Find what you need with new enhanced search.
*   For searches and help try:

© Copyright 1996–2024 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index