How to calculate the (odd ,even) condition in the following Poisson distribution for p_z parameter? i need some help in the code bellow

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Sofy 2019-7-12

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评论： Rik 2019-7-15

when q=[0.1,0.2,0.3,0.4,0.5] and p =1-q, z=6

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Torsten 2019-7-12

And what are q_1, p_1, q_2, p_2 ? In your case q_1 = 0.1, p_1 = 0.9, q_2 = 0.2, p_2 = 0.8 ?

Walter Roberson 2019-7-12

Sofy comments

yeah

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Torsten 2019-7-12

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编辑：Torsten 2019-7-12

function main
  p1 = 0.9;
  p2 = 0.8;
  q1 = 1-p1;
  q2 = 1-p2;
  z = 6;
  vec = zeros(1,z);
  vec(1:2:end) = q1/p1;
  vec(2:2:end) = q2/p2;
  lambda = sum(vec);
  terms_right = [1-fliplr(cumprod(vec)), 0];
  terms_left = lambda.^(0:z)./factorial(0:z);
  P_z = 1 - exp(-lambda)*sum(terms_left.*terms_right)
end 