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Math Help - unequal probability sampling

  1. #1
    Junior Member
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    unequal probability sampling

    for unequal probability sampling with replacement i have an auxiliary variable that the probability of selecting an element should be proportional to but i dont know how to find what the probability would be.

    eg.
    element# value auxilary variable
    1 12 5
    2 18 3
    3 25 1

    how do i find what the probability of selecting say sample 1,2.
    i thought it would be (5/9)*(3/9) but when add up all possible samples the probabilities dont add to one so it doesnt make sense.
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  2. #2
    Senior Member Sambit's Avatar
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    Quote Originally Posted by stumped765 View Post
    for unequal probability sampling with replacement i have an auxiliary variable that the probability of selecting an element should be proportional to.............
    What is it proportional to?
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