通过前端计算得到 数据相关性

/*计算平均数*/
function ArrAvg(x) {
	var sum = x.reduce(function(a, b) {
		return a + b
	});
	return sum / (x.length);
}

/*计算方差*/
function ArrVar(x) {
	var avg = ArrAvg(x);
	var res = 0;
	for(let i = 0; i < x.length; i++) {
		res = res + Math.pow((x[i] - avg), 2) / (x.length);
	}
	return res;
}

/*计算协方差*/
function ArrCov(x, y) {
	var cov = 0;
	var xAvg = ArrAvg(x);
	var yAvg = ArrAvg(y);
	for(var i = 0; i < (x.length); i++) {
		cov = cov + (x[i] - xAvg) * (y[i] - yAvg);
	}
	return cov / (x.length);
}

/*计算相关性*/
function ArrPer(x, y) {
	return ArrCov(x, y) / (Math.sqrt(ArrVar(x) * ArrVar(y)));
}


加密之后代码


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