# Cdf for multinomial

**URL:** <https://discourse.julialang.org/t/cdf-for-multinomial/103917>\
**Category:** General Usage\
**Created:** [September 15, 2023, 10:10pm UTC](https://discourse.julialang.org/t/cdf-for-multinomial/103917 "2023-09-15T22:10:30Z")\
**Posts on this page:** 1\
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**Author:** ![Joris\_Pinkse](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/joris_pinkse/32/216398_2.png) [@Joris\_Pinkse](https://discourse.julialang.org/u/Joris_Pinkse)\
**Post date:** [September 18, 2023, 8:19pm UTC](https://discourse.julialang.org/t/cdf-for-multinomial/103917/16 "2023-09-18T20:19:52Z")

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@skleinbo @Dan Yeah, the convolution thing works and one can express the characteristic function of the sum of iid truncated Poissons as a simple product of incomplete gamma functions (times a ratio involving only an exponential and a factorial) with first argument an integer. Haven’t tried the inverse transformation, which would be the final step.

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