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Thread: Area Probability comparison

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    Area Probability comparison




    It's been a while since I have studied statistics, but it seems I need it for my work.

    I have found and area of intersection between two others on the earth. Now I would like to know if I took one of the areas and replaced it with an area of the same size, but in a totally random position, what is the probability of the new intersection being bigger than my old one. Or by this I mean the method I would use to do it.

    It may be have written this badly, if I have just let me know and I'll rephrase the question.

    Thanks

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    Re: Area Probability comparison

    Seemingly you want to have two set X_0, Y and know the size of the intersection |X_0 \cap Y|

    Now you want to assume that there is a random set X which is a subset of a certain universe S and conditional on |X| = |X_0|

    And now you want to find

    \Pr\{|X \cap Y| > |X_0 \cap Y|\}

    If the above formulation is what you want, I think the question is quite advanced. You will need quite a bit of random set theory; it is because you need to define what do you mean by allowing a set distributed, let say "uniformly" inside a superset. After defining such probability measure we will have some knowledge to calculate the required probability. I can find a document like

    http://www.cemmap.ac.uk/resources/mo...tures_sets.pdf

    and I must admitted that I not touching these topics before. Maybe I am over-complicating the issues here.

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    Re: Area Probability comparison


    I think what you're saying is right. I also know the size of |X| and |Y|. Also the set can be distributed uniformly. I have no experience of random set theory and assumed it maybe solvable using basic probability theory. But it appears that I am wrong. :/

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