Notation question

  • Thread starter engineer23
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  • #1
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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?
 

Answers and Replies

  • #2
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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).
 
  • #3
stewartcs
Science Advisor
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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?

The y is the value that Y takes on.

CS
 

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