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Thread: Paired T-Test Debate

  1. #16
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    Re: Paired T-Test Debate




    Quote Originally Posted by Dason View Post
    Here is my data: Should I use a 2-sample t-test?

    Attachment 4260
    You should definitely use the Shotgun method!

    (You know that Efron was suggested to call his method for "the Shotgun" instead of the Bootstrap.)

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    Re: Paired T-Test Debate

    I never knew that
    The mathematical explanation of a statistical procedure is really just pseudo-code, which we can make operational by translating it into real computer code. --B. Klemens

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    Re: Paired T-Test Debate

    Miner, what do you mean by "shotgun pattern"? I have no idea what kind of pattern this refers to.
    “In God we trust. All others must bring data.”
    ~W. Edwards Deming

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    Re: Paired T-Test Debate

    white noise
    The mathematical explanation of a statistical procedure is really just pseudo-code, which we can make operational by translating it into real computer code. --B. Klemens

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    Re: Paired T-Test Debate

    Dason, Work on the stock a little. That one went right over my head.

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    Re: Paired T-Test Debate

    Quote Originally Posted by Jake View Post
    Miner, what do you mean by "shotgun pattern"? I have no idea what kind of pattern this refers to.
    Just a roughly circular spread of random data sets with no discernible pattern. Just like you would get from discharging a shotgun against a target.

    I generated this graph by creating two independent sets of 30 data points from the standard normal distribution then graphing them.
    Attached Images  

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    Re: Paired T-Test Debate

    I think the key is not if it is a shotgun pattern, but if there is a pattern at all I think Dason's data did have a pattern, which suggests to me a paired t-test.
    "Very few theories have been abandoned because they were found to be invalid on the basis of empirical evidence...." Spanos, 1995

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    Re: Paired T-Test Debate

    Quote Originally Posted by noetsi View Post
    I think the key is not if it is a shotgun pattern, but if there is a pattern at all I think Dason's data did have a pattern, which suggests to me a paired t-test.
    You missed the obvious also. Look at it closely, and it forms the outline of of a shotgun. A pump-action shotgun if I'm correct. I didn't catch it until Dason said it was a joke.

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    Re: Paired T-Test Debate

    lol I missed that entirely.
    "Very few theories have been abandoned because they were found to be invalid on the basis of empirical evidence...." Spanos, 1995

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    Re: Paired T-Test Debate

    Quote Originally Posted by gene2420 View Post

    She wanted to see if there was a difference between the Disorder group and the Control group. I hadalways thought to run an Independent Samples T-Test..

    The easiest approach is to look at the correlation between the Disorder and Control groups....if you have a correlation of, say, 0.20 or greater than use the paired samples t-test.

    Note that the two Independent Samples T-test implies that there is no correlation between the two groups. (Independence implies zero correlation).

    It can be easily shown that the two-independent samples T-test (with equal sample sizes) is just a special case of the Paired samples T-test (I.e., setting the correlation to zero in the denominator).

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    Re: Paired T-Test Debate


    I agree with Greta!
    "victor is the reviewer from hell" -Jake
    "victor is a machine! a publication machine!" -Vinux

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