Hi R-users,I'm trying to solve a non linear equation, to find the degrees of
freedom of a mixture of t student. I'm sure i wrote the minimization
equation in the right way, but when i try to run the EM algorithm to
estimate the parameters of the mixture, the following error will appear:

Error in uniroot(function(z) log(z/2) - digamma(z/2) + 1 - log((z + d)/2) +
 :
  f() values at end points not of opposite sign

I don't know how solve this problem, i have already tried using the function
optimize, but it doesn't work.
Someone could help me?
thanks a lot


-- 
Dr. Daniele Riggi, PhD student
University of Milano-Bicocca
Department of Statistics
Building U7, Via Bicocca degli Arcimboldi, 8
20126 Milano, Italy
cell. +39 328 3380690
mailto: daniele.riggi@gmail.com

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