21 lines
417 B
JavaScript
21 lines
417 B
JavaScript
function running_stddev() {
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var n = 0;
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var sum = 0.0;
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var sum_sq = 0.0;
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return function(num) {
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n++;
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sum += num;
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sum_sq += num*num;
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return Math.sqrt( (sum_sq / n) - Math.pow(sum / n, 2) );
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}
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}
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var sd = running_stddev();
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var nums = [2,4,4,4,5,5,7,9];
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var stddev = [];
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for (var i in nums)
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stddev.push( sd(nums[i]) );
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// using WSH
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WScript.Echo(stddev.join(', ');
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