The formula below appeared in my mailer as
Z = ( b1 ^ b2 ) / ( SEb1^2 + SEb2^2 ) ^ 1/2
(with four instances of the symbol ^); although the editor in which
this reply is being composed shows ^V for the first of these.
Presumably that first symbol is a minus sign ?
And does not this formula presuppose that b1 and b2 are uncorrelated?
That may be a reasonable assumption for the original poster's
(Msherif's) situation, but there really wasn't enough information
provided to know whether that's reasonable or not -- depends on what
that "nonlinear model" actually is, and on what "sector" means in the
original post.
On Wed, 8 Oct 2003, Brett Magill wrote:
> Here is a formula to compute Z, which can then be
> referred to a normal distribution.
>
> Z = ( b1 � b2 ) / ( SEb1^2 + SEb2^2 ) ^ 1/2
-----------------------------------------------------------------------
Donald F. Burrill [EMAIL PROTECTED]
56 Sebbins Pond Drive, Bedford, NH 03110 (603) 626-0816
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