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Thread: Should you use a dependent t-test to measure difference across time?

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    Should you use a dependent t-test to measure difference across time?

    Is it proper to use dependent t-test to measure difference across time for scores IF the participants are different people? Although they are different people, the demographic characteristics that's relevant to the scores being compared is very constant.

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    Re: Should you use a dependent t-test to measure difference across time?

    Are you able to track data at the individual-level? So that you know how many people are lost and gained.
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    Re: Should you use a dependent t-test to measure difference across time?

    Quote Originally Posted by hlsmith View Post
    Are you able to track data at the individual-level? So that you know how many people are lost and gained.
    By that do you mean the sample size? Yes, that's not an issue.

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    Re: Should you use a dependent t-test to measure difference across time?

    Interesting. I've posted this question to couple of statistics forums and it all seem to not get much traction. Perhaps this is a harder question to answer than I initially thought. Perhaps subjective in a way.

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    Re: Should you use a dependent t-test to measure difference across time?

    If you cannot pair the data, then it is not possible to carry out a dependent t-test. So where is the problem?
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    Re: Should you use a dependent t-test to measure difference across time?

    dependent t-test to measure difference across time for scores IF the participants are different people?
    How can you do this (and why would you want to)? The point of dependent t test is you are comparing the same thing at two points in time (normally) so it is not valid to use an independent t test. If your observations are different why do you need to use paired t test?

    I am guessing you are matching something at point one to something similar at point 2.
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