Average deviations

  • Thread starter chynawok
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  • #1
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Why is the average of the deviations of a set of measurement values always zero?
 

Answers and Replies

  • #2
Hurkyl
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Deviations from what?
 
  • #3
Galileo
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You probably mean, why is:

[itex]\langle X-\langle X\rangle \rangle =0[/itex]

for any distribution X. It's in the nature of the average. Use the linearity of expectations to show it.
 

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