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Last change
on this file since e4c61dd was e4c61dd, checked in by istevanoska <ilinastevanoska@…>, 6 months ago |
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Prototype 1.1
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Property mode
set to
100644
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File size:
668 bytes
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| 1 | export default function variance(values, valueof) {
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| 2 | let count = 0;
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| 3 | let delta;
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| 4 | let mean = 0;
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| 5 | let sum = 0;
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| 6 | if (valueof === undefined) {
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| 7 | for (let value of values) {
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| 8 | if (value != null && (value = +value) >= value) {
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| 9 | delta = value - mean;
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| 10 | mean += delta / ++count;
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| 11 | sum += delta * (value - mean);
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| 12 | }
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| 13 | }
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| 14 | } else {
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| 15 | let index = -1;
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| 16 | for (let value of values) {
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| 17 | if ((value = valueof(value, ++index, values)) != null && (value = +value) >= value) {
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| 18 | delta = value - mean;
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| 19 | mean += delta / ++count;
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| 20 | sum += delta * (value - mean);
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| 21 | }
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| 22 | }
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| 23 | }
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| 24 | if (count > 1) return sum / (count - 1);
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| 25 | }
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