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Math Help - Conditional variance

  1. #1
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    Conditional variance

    If a matrix looks like this
    .....-3 0 3 <-x
    ....0 0 0 0.2
    y..1 0 0.2 0.1
    ....2 0.3 0.2 0


    how do u calculate the variance for x, given y = 2?
    How do u even find the probability function for x in this case with a conditional?
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  2. #2
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    Do you know how to find the marginals of a Random Variable X (or Y)? What you want to do is not possible otherwise.
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  3. #3
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    You mean the marginal probability? I think you sum the rows and columns in the 3x3 matrix to get that.
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