need a curve fitting package

Patrice Boily pboily at uoguelph.ca
Tue Feb 15 12:50:16 EST 1994

John Kuszewski (johnk at spasm.niddk.nih.gov) wrote:

: I = exp(-kf1 * tf) * (kex/(kex + kf2)) *
:     (1 - exp( -(kf2 + kex)* tex))

: kex is a known constant.
: I, tf, and tex are known variables.

: I need to optimize values of kf1 and kf2 against
: sets of several (I, tf, tex) values.

The NONLIN function in SYSTAT will take care of this problem quite easilly

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