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28 lines
615 B
JavaScript
28 lines
615 B
JavaScript
module.exports = {
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roundTo2(num) {
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return Math.round((num + Number.EPSILON) * 100) / 100;
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},
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stdDev(array) {
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const n = array.length;
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const mean = array.reduce((a, b) => a + b) / n;
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return Math.sqrt(
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array.map((x) => Math.pow(x - mean, 2)).reduce((a, b) => a + b) / n
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);
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},
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mean(array) {
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try {
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return (
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array.reduce((previous, current) => (current += previous)) /
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array.length
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);
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} catch (e) {
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return 0;
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}
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},
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kogasa(cov) {
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return (
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100 * (1 - Math.tanh(cov + Math.pow(cov, 3) / 3 + Math.pow(cov, 5) / 5))
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);
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},
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};
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