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Math Help - Pearsons rank bivariate correlation Help!

  1. #1
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    Post Pearsons rank bivariate correlation Help!

    Helloooo

    I am assessing the correlation between two variables;

    For pearsons rank you need both variables to be of normal distribution and be continous data?

    1 of my variables are median dates between two time points, there are 140 pieces of data and they are not at regular intervals.

    The other variable is continous and normally distributed.

    Can I use pearsons?

    Thanks

    Ali
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  2. #2
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    Re: Pearsons rank bivariate correlation Help!

    Hey squidders.

    How big is your data sample? If you have enough samples then expectations (i.e. means) will have an approximate normal distribution.
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  3. #3
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    Re: Pearsons rank bivariate correlation Help!

    The sample size is 161.

    Even if the data is normally distributed, I thought date was discrete data not continous?

    Can I use pearsons as it is a large sample size?

    Thanks Chiro!
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  4. #4
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    Re: Pearsons rank bivariate correlation Help!

    If you have enough points in the distribution, you may be able to assume continuity in the distribution.

    Given you sample size I think you might be able to use the normal correlation co-efficient.

    I'm basing this on the CLT where the distribution of the mean (of some arbitrary distribution) approaches a Normal distribution regardless of the input distribution.
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