[S] SE's for ratio of two parameters

Pedro de Barros (pbarros@ualg.pt)
Thu, 25 Jun 1998 16:16:57 +0100


Dear all, this is in fact more like a statistical question, but I hope
someone from the list will know the answer.
I have been fitting the Michaelis-Menten model (simple hyperbola) to several
data sets. I have been able to get approximate SE's for the two parameters
thanks to Prof. Ripley, but I am unsure of how to calculate the SE for a
derived parameter which is A=B1/B2. I have the (approximate) var-covar
matrix for B1, B2, so I thought I would use it to get an approximation to
the SE of A.
Any good hints? (I was thinking of treating A as a ratio estimator, but I
could not get at bibliography on this specific problem...)

Thanks for any help,
Pedro
============================================================================
==========
Pedro de Barros Tel: +351 89 800918/900/100
Universidade do Algarve Fax: +351 89 818353
Unidade de Ciencias e Tecnologias dos Recursos Aquáticos E-mail:
pbarros@ualg.pt
Campus de Gambelas, 8000 FARO, PORTUGAL

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