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MathGroup Archive 2001

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Re: non-linear regression

  • To: mathgroup at smc.vnet.net
  • Subject: [mg30160] Re: non-linear regression
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Wed, 1 Aug 2001 02:19:14 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <9k5r0p$hbg$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

Needs["Statistics`NonlinearFit`"]

?NonlinearRegress

"NonlinearRegress[data, model, vars, params] searches for a
least-squares fit \
to a list of data according to the model containing the variables vars
and \
the parameters params.  Parameters may be expressed as a list of symbols
or a \
list of lists.  When expressed as a list, a parameter may be specified
with \
starting value(s) and bounds in one of several different ways: {symbol,
\
start} or {symbol, min, max} or {symbol, start, min, max}, where start
can be \
single value or a list of two values. The data can have the form {{x1,
y1, \
..., f1}, {x2, y2, ..., f2}, ...},  where  the number of coordinates x,
y, ... \
is equal to the number of variables in the  list vars.  The data can
also be \
of the form {f1, f2, ...}, with a single coordinate assumed to take
values 1, \
2, ....  The Method option specifies the LevenbergMarquardt (default), \
Gradient (steepest descent), Newton, QuasiNewton or Automatic search
methods. \
 The Automatic method does linear fitting for linear models and \
LevenbergMarquardt nonlinear fitting for nonlinear models"

Regards
  Jens

Derek Stoll wrote:
> 
> I am looking to do non-linear regression on an equation with two
> variables.
> 
> It is of the form V1 * tanh(v2*L/f) *tanh(v3 * L/f)
> 
> Can anyone point me in the right direction for a good routine?  Thank
> you,
> Derek
> dcstoll at us.ibm.com


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