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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 Gauß-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 Gauß-curves to be fitted,it is no > > > problem to find > > > values > > > in Stata.but if I have to find three Gauß-curves,I mean to > > > come from 1) to > > > 2) for > > > example > > > > > > 1) > > > Ai for i = 1,2.... means amplitude > > > A1 12209.2 > > > µ1 4.382678 > > > delta1 0.3097696 > > > A2 21683.69 > > > µ2 4.200002 > > > delta2 0.550282 > > > > > > 2) > > > A1 11509.05 > > > µ1 4.403567 > > > delta1 0.3050716 > > > A2 1305.195 > > > µ2 4.18422 > > > delta2 1.100233 > > > A3 21540.19 > > > µ3 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: > * 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: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**st: Re: t TEST Significant Levels***From:*Zoue Lloyd Wright <zoue.lloyd-wright@kcl.ac.uk>

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