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st: RE: Inverse hyperbolic sine function
This beast is also known as
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.
> 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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