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    Question presence absence data




    I have a data set of fish presence/absence in 15 different lakes. The fish communities include the following combinations: only species A; only species B; only species C; species A, B and C; species A and B; species A and C and; species B and C.

    We think species A is out competed by species B and C and is found less often in lakes with species B or C or lakes that have both species B and C.

    How would I go about analyzing this?

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    Re: presence absence data

    one simple way might be to look at a contingency table design and have columns as: species A present and species A absent. Rows would be: Species B present: Species C present and Species B and C present. Enter the number occurrences for each cell.
    The earth is round: P<0.05

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    Re: presence absence data

    Quote Originally Posted by bugman View Post
    one simple way might be to look at a contingency table design and have columns as: species A present and species A absent. Rows would be: Species B present: Species C present and Species B and C present. Enter the number occurrences for each cell.
    Thanks ...

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    Re: presence absence data


    Right. So was that helpful to you?Some times feedback is appreciated.
    The earth is round: P<0.05

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