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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