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From |
"Andreas Aschbacher" <aa_surf@gmx.at> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: LevenbergMarquardt/summary |

Date |
Tue, 9 Mar 2004 11:07:46 +0100 (MET) |

Dear fellows ! 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. someone knows advice ? andreas aschbacher -- +++ NEU bei GMX und erstmalig in Deutschland: TÜV-geprüfter Virenschutz +++ 100% Virenerkennung nach Wildlist. Infos: http://www.gmx.net/virenschutz * * 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/

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