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scipy.special.pdtrc

scipy.special.pdtrc(x1, x2[, out]) = <ufunc 'pdtrc'>

y=pdtrc(k,m) returns the sum of the terms from k+1 to infinity of the Poisson distribution: sum(exp(-m) * m**j / j!, j=k+1..inf) = gammainc( k+1, m). Arguments must both be positive and k an integer.