Programming expectation algorithm for negative binomial distribution
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For the negative binomial distribution, there is a dispersion parameter to be estimated along with beta parameters. There is an error in defining the dispersion parameter.
How to define the dispersion parameter correctly.
Following is the code:
function logL = em_nbl(theta,ex,j)
global y x k n ;
beta= theta(k);
al=theta(k+1);
for i= 1:n,
L(i) = ex(i,j)*(log(gamma(y(i)+1/(al)))+y(i)*log(al)+(y(i)-1)*(x(i,:)*beta)-(y(i)+1/al)*log(1+al*(x(i,:)*beta))-log(gamma(1/a1)));
end;
logL = -sum(L);
return;
Following is the error:
Error using em_nbl (line 6)
Not enough input arguments.
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