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Q-Q plot equivalent for discrete variable?

  1. Dec 3, 2012 #1

    You can use a Q-Q plot to visually test if 2 continuous variables are from the same distribution and you get a straight line.

    Is there a way to visually test if 2 discrete variables are from the same distribution? Also is there a way to test it mathematically?

  2. jcsd
  3. Dec 4, 2012 #2


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    Education Advisor

    You can do a Q-Q plot for discrete data, but it's a bit more tricky, i'll try to find a source for you.
  4. Dec 4, 2012 #3
  5. Dec 4, 2012 #4
    Hi there,

    Apart from using a Q-Q plot is there any other way to test if two variables have the same distribution?

  6. Dec 4, 2012 #5


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    Science Advisor

    A chisquare test?
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