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st: RE: RE: RE: LevenbergMarquardt/summary


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: RE: LevenbergMarquardt/summary
Date   Tue, 9 Mar 2004 10:58:30 -0000

Stephen's right. 

. findit denormix 

Nick 
n.j.cox@durham.ac.uk 

> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Stephen P
> Jenkins
> Sent: 09 March 2004 10:33
> To: statalist@hsphsun2.harvard.edu
> Subject: st: RE: RE: LevenbergMarquardt/summary
> 
> 
> If you want to fit a mixture of normals, then I think Stas 
> Kolenikov has
> a program for doing this. 
> -findit- should locate this
> 
> 
> Stephen
> -------------------------------------------------------------
> Professor Stephen P. Jenkins <stephenj@essex.ac.uk>
> Institute for Social and Economic Research
> University of Essex, Colchester CO4 3SQ, U.K.
> Tel: +44 1206 873374.  Fax: +44 1206 873151.
> http://www.iser.essex.ac.uk   
> 
> 
> > -----Original Message-----
> > From: owner-statalist@hsphsun2.harvard.edu 
> > [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
> > Sent: 09 March 2004 10:16
> > To: statalist@hsphsun2.harvard.edu
> > Subject: st: RE: LevenbergMarquardt/summary
> > 
> > 
> > It might be better to set this up as a -ml- problem. 
> > 
> > The text of Sophia Rabe-Hesketh and Brian Everitt
> > discusses the two Gaussians case in detail and poses
> > your case as an exercise, with hints for solution. 
> > 
> > http://www.stata.com/bookstore/statanalyses.html
> > 
> > Nick 
> > n.j.cox@durham.ac.uk 
> > 
> > Andreas Aschbacher
> > 
> > > In austrian centre of physics we use Stata to do
> > > LevenbergMarquardt(nl-coomand)
> > > please look at my posting from january 20th with
> > > heading:LevenbergMarquardt
> > > short summary :the number of persons who is exposed to a little 
> > > dosis-interval /about 0.01 mSv/ yields in sum a curve which 
> > is mostly
> > > composed of 
> > > two sometimes three humps.above each dosis-interval /about 
> > > 0.01 mSv/there is
> > > the number 
> > > of persons as function. with Stata it was possible to show 
> > that in 397
> > > cases we have the sum of Gau-distributions.the results are 
> > > very useful.
> > > because of lv-command we can talk here about skewness of 
> our curves.
> > > median-test is also used very often.we decided to take Stata 
> > > to use for our
> > > work becaue it is so easy to split in subgroups and make 
> > tests after.
> > >                                 -
> > > 
> > > My question: if I have two Gau-curves to be fitted,it is no
> > > problem to find
> > > values
> > > in Stata.but if I have to find three Gau-curves,I mean to 
> > > come from 1) to
> > > 2) for
> > > example
> > > 
> > > 1)
> > > Ai for i = 1,2.... means amplitude
> > > A1	12209.2
> > > 1	4.382678
> > > delta1	0.3097696
> > > A2	21683.69
> > > 2	4.200002
> > > delta2	0.550282
> > > 
> > > 2)
> > > A1	11509.05
> > > 1	4.403567
> > > delta1	0.3050716
> > > A2	1305.195
> > > 2	4.18422
> > > delta2	1.100233
> > > A3	21540.19
> > > 3	4.198081
> > > delta3	0.5104234
> > > 
> > > I need long time to try.with another famous statistical
> > > software I have
> > > possibility to make 
> > > constraints and it takes no long time.
> > > I "fear the worst" that someone(my boss?) will ask me during my
> > > presentation,if there are add-inns in Stata to use or 
> > > user-written-programs that I have
> > > this feature.
> > > it is a pity that it is not possible for me to come to 2nd 
> > > German Stata
> > > User's meeting in April.
> > 
> > *
> > *   For searches and help try:
> > *   http://www.stata.com/support/faqs/res/findit.html
> > *   http://www.stata.com/support/statalist/faq
> > *   http://www.ats.ucla.edu/stat/stata/
> > 
> 
> 
> *
> *   For searches and help try:
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> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
> 

*
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