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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

fellpar_cdf(x, alpha, bet)
% fellpar_cdf.m - evaluates a Feller Pareto Cumulative Distribution.
%   See "Advances in Information Retrieval", ed. F. Crestani, M. Girolami, 
%   C.J. van Rijsbergen, March 2002, 
%   "Term frequncy Normalization via Pareto Distributions", G. Amati et al.
%
%  Created by Jim Huntley,  08/17/11
%

function [cdf] = fellpar_cdf(x, alpha, bet)

pdf = fellpar_pdf(x, alpha, bet);

sx = size(x,2);
dx = x(2) - x(1);
for jx = 1:sx
    if(jx <= 2)
        cdf(jx) = trapz(pdf(1:jx)) * dx;
    elseif(jx > 2)
        cdf(jx) = simps(pdf(1:jx)) * dx;
    end
end

return

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