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Generation of Random Variates

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Generation of Random Variates

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generates random variates from over 870 univariate distributions

qb4_pdf(n, p, phi, nn)
% qb4_pdf.m - evaluatess a Quasi Binomial IV Probability Density.
%   See "Parameter Estimation, Data Fitting, and Limiting Distribution of QBD III and QBD IV",
%   S. Chakraborty, Dibrugargh U., SCRA 2004 FIM XI, Dec.27-29, 2004, Inst. of Engr. & Tech.,
%   Lucknow, India.
%
%  Created by Jim Huntley,  01/15/08
%

function [pdf] = qb4_pdf(n, p, phi, nn)

coef = p^2 * (p+phi) * (1-p-nn*phi) / ((p+phi)*(1-nn*phi)-nn*p*phi*(1-(nn-1)*phi));

for jn = 1:size(n,2)        
    pdf(jn) =  coef * binomial_coef(nn,n(jn)) * (p+n(jn)*phi)^(n(jn)-2) * ...
              (1-p-n(jn)*phi)^(nn-n(jn)-1);
end

return

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