Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
st: From: Michael Begg <[email protected]>
From
[email protected]
To
[email protected]
Subject
st: From: Michael Begg <[email protected]>
Date
Wed, 23 Mar 2011 11:22:46 +1100
Hi all,
I am trying to estimate the equation y = b1*exp(b2*exp(b3*x)) using the
following:
nl (y = b1*exp(b2*exp(b3*x)))
Stata takes b3 as a constant and b2 is omitted.
Why is this happening?
If I use the inbuilt gompertz function form y = b1*exp(-exp*(b2*(b3 - x)))
using
nl gom3: y x
it works fine.
Thanks for your help
Cheers
Michael
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/