Cumulative standard deviation: Difference between revisions
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value 9 SD = 2.0 |
value 9 SD = 2.0 |
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</pre> |
</pre> |
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Functional: |
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<lang Swift> |
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func standardDeviation(arr : [Double]) -> Double |
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{ |
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let length = Double(arr.count) |
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let avg = arr.reduce(0, { $0 + $1 }) / length |
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let sumOfSquaredAvgDiff = arr.map { pow($0 - avg, 2.0)}.reduce(0, {$0 + $1}) |
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return sqrt(sumOfSquaredAvgDiff / length) |
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} |
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let responseTimes = [ 18.0, 21.0, 41.0, 42.0, 48.0, 50.0, 55.0, 90.0 ] |
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standardDeviation(responseTimes) // 20.8742514835862 |
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standardDeviation([2,4,4,4,5,5,7,9]) // 2.0 |
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</lang> |
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=={{header|Tcl}}== |
=={{header|Tcl}}== |