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Binomdist

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    Binomdist

    I'm working on a probability model in Excel and I'm trying to use the BINOMDIST function but I'm running into an issue with the results.

    Here's my function BINOMDIST(1,2,1/3,FALSE), the result I get is .4444. I agree with the result but it isn't what I'm looking for. The function as written, and thus the result, is giving me the probability of having exactly 1 success.

    I want to know the probability of having at least 1 success. So I attempted to use BINOMDIST(>1,2,1/3,FALSE) but the function doesn't work with the > symbol in there.

    Any thoughts?

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    Re: Binomdist

    Binomdist(1,2,1/3,true)

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    Re: Binomdist

    Binomdist(1, 2, 1/3, true) ~ 89% gives the probability of having at most 1 success, i.e., 0 or 1.

    The probability of at least 1 success is

    1 - Binomdist(0, 2, 1/3, true) ~ 56%
    Entia non sunt multiplicanda sine necessitate

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    Re: Binomdist

    Quote Originally Posted by shg View Post
    Binomdist(1, 2, 1/3, true) ~ 89% gives the probability of having at most 1 success, i.e., 0 or 1.

    The probability of at least 1 success is

    1 - Binomdist(0, 2, 1/3, true) ~ 56%
    Yes this works, but I still can't seem to figure out how to apply this to other probabilities for some reason.

    For example, I also want to figure out the odds of getting 2 successes in 2 tests with 1/3 odds, which I believe is ~11% but I can't write the function correctly to calculate it.

    EDIT: I think I got it 1-BINOMDIST(s-1,tests,1/3,TRUE) seems to work
    Last edited by tedcahill2; 03-13-2018 at 11:54 AM.

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    Forum Expert shg's Avatar
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    Re: Binomdist

    I also want to figure out the odds of getting 2 successes in 2 tests with 1/3 odds ...
    =BinomDist(2, 2, 1/3, false)

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