Cumulative standard deviation: Difference between revisions
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Using a state variable: |
Using a state variable: |
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<lang perl6># remember that <(x-<x>)²> = <x²> - <x>² |
<lang perl6># remember that <(x-<x>)²> = <x²> - <x>² |
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sub stddev($x) { |
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state @sum; |
state @sum; |
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return sqrt( |
return sqrt( |
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