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Statistics: moment prime'?

  1. Apr 10, 2013 #1
    sometimes in statistics there is a prime ( ' ) after the variable for moment ( u sub r ) what does that mean?
  2. jcsd
  3. Apr 10, 2013 #2

    Simon Bridge

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    Please provide an example.
    The prime notation is used to differentiate the variable name while keeping a general meaning ... so t and t' are both "time" but may be for different objects or have different uses as in a place-holder variable.
  4. Apr 10, 2013 #3

    Stephen Tashi

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    As Simon says. ( I had to day that!)
    In particular, the prime notation is often used to distinguish a "moment about the origin" from a "moment about the mean" of a distribution as in https://en.wikipedia.org/wiki/Central_moment
    Last edited: Apr 10, 2013
  5. Apr 10, 2013 #4
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