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Notation question

  1. Jan 22, 2009 #1
    What is the difference between Yi (capital Y, subscript i) and yi (lowercase y, subscript i)?
    Is Yi a random variable while yi is a part of a set?
  2. jcsd
  3. Jan 23, 2009 #2
    In most cases, Y_i refers to the random variable (i.e. the probability distribution) and y_i to an observation of that variable (e.g. a numerical value).
  4. Jan 23, 2009 #3


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    Science Advisor

    The y is the value that Y takes on.

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