Many Thanks David.

2012/1/22 David Winsemius [via R] <ml-node+s789695n4318880h49@n4.nabble.com>

>
> On Jan 22, 2012, at 1:25 PM, Eliano wrote:
>
> > People,
> >
> > I'm researching some Bayesian statistic topics and in the midle of
> > my study
> > i found a very simple problem and i'm trying to find a simple
> > package to
> > solve this type of equations:
> >
> > Lets say that i need to compute beta values for the beta
> > distribution and i
> > now for example:
> >
> > E(teta)=a/(a+b) = 0,5
> > Var(teta)=ab/((a+b)^2(a+b+1))=0.05
> >
> > So if i want to solve this to non-linear system to find a,b for the
> > beta
> > distribution wich pack should i use?
> >
> > I know that a=2 and b=2 because i calculated it.
>
> It depends on you meaning for the word "solve". If you want symbolic
> math, then the Ryacas package provides that facilities. If you want
> numerical estimation, then you should provide the data in your posting
> AND study the help pages for `nls` AND do searches in the Task Views
> AND the rhelp Archives for the wealth of worked examples available .
>
> --
>
> David Winsemius, MD
> West Hartford, CT
>
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