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Math Help - types of variables vs levels of measurments

  1. #1
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    [RESOLVED]types of variables vs levels of measurments

    I'm confused about the levels of measurements: nominal, ordinal, interval and ratio.
    So levels of measurements are a different concept than types of variables (numerical and categorical)? Do numerical variables normally get described using interval or ratio scale whereas categorical variables get described using nominal and ordinal scales?
    Last edited by superdude; May 17th 2010 at 08:33 PM. Reason: resolved
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  2. #2
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    Quote Originally Posted by superdude View Post
    I'm confused about the levels of measurements: nominal, ordinal, interval and ratio.
    So levels of measurements are a different concept than types of variables (numerical and categorical)? Do numerical variables normally get described using interval or ratio scale whereas categorical variables get described using nominal and ordinal scales?
    nominal (categorical)-male, female; republican, democrat, etc:
    \chi^2

    ordinal- ranked values such as 1st place, 2nd place, etc; economic status:
    no exciting test to do

    interval- difference between the values is meaningful $600 vs $700: (not meaningful) how happy you are on a scale of 1-10:
    Standard Deviation, regression, correlation, ANOVA

    Ratio- defined 0 GPA,Kelvin:
    All tests
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  3. #3
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    Quote Originally Posted by dwsmith View Post
    nominal (categorical)-male, female; republican, democrat, etc:
    \chi^2
    So nominal and categorical are the same thing?
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  4. #4
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    Quote Originally Posted by superdude View Post
    So nominal and categorical are the same thing?
    Yes
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