tina
35 lines
1.4 KiB
JavaScript
35 lines
1.4 KiB
JavaScript
export default function getPeriodLengthStats(cycleLengthArray) {
|
|
if (Array.isArray(cycleLengthArray) && (cycleLengthArray.length > 0) && cycleLengthArray.every(cycleLength => {
|
|
return (typeof cycleLength === 'number') && !(isNaN(cycleLength))
|
|
})) {
|
|
const PeriodLengthStats = {}
|
|
const sortedCycleLegthArray = cycleLengthArray.sort((a, b) => {
|
|
return a - b
|
|
})
|
|
PeriodLengthStats.minimum = sortedCycleLegthArray[0]
|
|
PeriodLengthStats.maximum = sortedCycleLegthArray[cycleLengthArray.length - 1]
|
|
PeriodLengthStats.mean = cycleLengthArray.reduce(getSum) / cycleLengthArray.length
|
|
// median
|
|
if (cycleLengthArray.length % 2 == 1) {
|
|
PeriodLengthStats.median = sortedCycleLegthArray[(cycleLengthArray.length + 1) / 2 - 1]
|
|
}
|
|
else {
|
|
const middle = cycleLengthArray.length / 2
|
|
PeriodLengthStats.median = (sortedCycleLegthArray[middle - 1] + sortedCycleLegthArray[middle]) / 2
|
|
}
|
|
|
|
PeriodLengthStats.stdDeviation = 0 // default
|
|
if (cycleLengthArray.length > 1) {
|
|
const sumOfSquares = cycleLengthArray.map(cycleLength => {
|
|
return Math.pow(cycleLength - PeriodLengthStats.mean, 2)
|
|
}).reduce(getSum)
|
|
PeriodLengthStats.stdDeviation = Math.sqrt(sumOfSquares / (cycleLengthArray.length - 1 ))
|
|
}
|
|
return PeriodLengthStats
|
|
}
|
|
console.error('getPeriodLengthStats requiers an array of numbers with length > 0.')
|
|
}
|
|
|
|
function getSum(total, num) {
|
|
return total + num
|
|
} |