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Math Help - What type of statistical test should I use?

  1. #1
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    What type of statistical test should I use?

    For some data in a survey I work on, I have two sets of current year-
    prior year ratios. I have a set of current-year prior year ratios for
    numbers that ended up being changed from what was originally reported
    by the data respondent (around 500 numbers in this set) and another
    set of current-year prior year ratios for numbers that were not
    changed from what was originally reported (around 800,000 numbers in
    this set). I wanted to do a statistical test to determine if the
    average current year-prior year ratio of the numbers that were changed
    on the survey are significantly different from the average current
    year prior year ratio of numbers that were not changed. What kind of
    test should I use? Also wanted to know if it might be better to
    separate the current-year prior year ratios into ratios that increased
    from the prior year vs. decreased from the prior year and run tests on
    each group?? Thanks for any advice...

    Julie
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by wardnine View Post
    For some data in a survey I work on, I have two sets of current year-
    prior year ratios. I have a set of current-year prior year ratios for
    numbers that ended up being changed from what was originally reported
    by the data respondent (around 500 numbers in this set) and another
    set of current-year prior year ratios for numbers that were not
    changed from what was originally reported (around 800,000 numbers in
    this set). I wanted to do a statistical test to determine if the
    average current year-prior year ratio of the numbers that were changed
    on the survey are significantly different from the average current
    year prior year ratio of numbers that were not changed. What kind of
    test should I use? Also wanted to know if it might be better to
    separate the current-year prior year ratios into ratios that increased
    from the prior year vs. decreased from the prior year and run tests on
    each group?? Thanks for any advice...

    Julie
    Forget about them being ratios, what you have are two sets of numbers
    and you want to know if they are from the same distribution. Looks like
    a chi-squared test is what is needed here (the Kolmogorov-Smirnov test
    is also probably appropriate).

    RonL
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