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Dear fellows !
In austrian centre of physics we use Stata to do
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
two sometimes three humps.above each dosis-interval /about 0.01 mSv/there is
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
in Stata.but if I have to find three Gauß-curves,I mean to come from 1) to
Ai for i = 1,2.... means amplitude
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
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 ?
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