8000 forbidden value message in Poisson distribution · Issue #2260 · numworks/epsilon · GitHub
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forbidden value message in Poisson distribution #2260

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fbeleznay opened this issue Nov 4, 2024 · 2 comments
Open

forbidden value message in Poisson distribution #2260

fbeleznay opened this issue Nov 4, 2024 · 2 comments
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@fbeleznay
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Describe the bug

I am not sure if it is a bug or not, but when I try to enter 6000 as the parameter of a Poisson distribution, O get a "forbidden value" message. Is there any reason why this value is not handled by Numworks? I did not find it documented anywhere. Other graphing calculators can work with this value. I am asking from a point of view of a teacher (IB Diploma programme). On exams questions involving this mean can come up and students will have no chance of getting an answer if they do.

Screenshots

screenshot

To Reproduce

Steps to reproduce the behavior:

  1. Go to the 'Distributions' app
  2. Scroll down to 'Poisson'
  3. Type '6000' for the parameter and scroll down to 'Next'

Expected behavior

I would like Numworks to handle this value, even though for this mean the Poisson distribution is close to the normal distribution.

Environment

Online emulator
@adri1numworks adri1numworks self-assigned this Nov 19, 2024
@adri1numworks
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We had to set a limit at one point. We can increase this value. How much would be satisfying?

@fbeleznay
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fbeleznay commented May 29, 2025 •
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I do not know the upper limit of values that can come up on exams.
May I ask, why you need a limit?
I tried my TI84 plus (a very old model) and it gave me a value instantly for 6000, 10000 and even 100000 as the mean (I tried cumulative probabilities). I do not know how they do it, but the values were consistent with values I got from online poisson probability calculators.
Maybe they use normal approximation after a certain value of the mean.
I will do some calculation of the error that can come up when using normal approximation and if it is below the smallest number Numworks can handle, then it should be fine.
Maybe, if the normal approximation is used, then a message can be displayed along with the probability.

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