Anonymous user
Cumulative standard deviation: Difference between revisions
no edit summary
(Nimrod -> Nim) |
No edit summary |
||
Line 2,641:
value 9 SD = 2.0
</pre>
Functional:
<lang Swift>
func standardDeviation(arr : [Double]) -> Double
{
let length = Double(arr.count)
let avg = arr.reduce(0, { $0 + $1 }) / length
let sumOfSquaredAvgDiff = arr.map { pow($0 - avg, 2.0)}.reduce(0, {$0 + $1})
return sqrt(sumOfSquaredAvgDiff / length)
}
let responseTimes = [ 18.0, 21.0, 41.0, 42.0, 48.0, 50.0, 55.0, 90.0 ]
standardDeviation(responseTimes) // 20.8742514835862
standardDeviation([2,4,4,4,5,5,7,9]) // 2.0
</lang>
=={{header|Tcl}}==
| |||