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calculation.ts
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calculation.ts
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/**
* Copyright (c) 2020 Visa, Inc.
*
* This source code is licensed under the MIT license
* https://github.com/visa/visa-chart-components/blob/master/LICENSE
*
**/
export function leastSquares(xSeries, ySeries) {
var reduceSumFunc = function(prev, cur) {
return prev + cur;
};
var xBar = (xSeries.reduce(reduceSumFunc) * 1.0) / xSeries.length;
var yBar = (ySeries.reduce(reduceSumFunc) * 1.0) / ySeries.length;
var ssXX = xSeries
.map(function(d) {
return Math.pow(d - xBar, 2);
})
.reduce(reduceSumFunc);
var ssYY = ySeries
.map(function(d) {
return Math.pow(d - yBar, 2);
})
.reduce(reduceSumFunc);
var ssXY = xSeries
.map(function(d, i) {
return (d - xBar) * (ySeries[i] - yBar);
})
.reduce(reduceSumFunc);
var slope = ssXY / ssXX;
var intercept = yBar - xBar * slope;
var rSquare = Math.pow(ssXY, 2) / (ssXX * ssYY);
return [slope, intercept, rSquare];
}
export function capitalized(str) {
return str.charAt(0).toUpperCase() + str.slice(1);
}