ts-error-measures
Computing error measures for time-series forecasting with javascript.
Official page of the library: http://vrivas.github.io/ts-error-measures/
Equations have been taken from: Rob J. Hyndman and Anne B. Koehler, "Another look at measures of forecast accuracy", International Journal of Forecasting (2006). 22(4), 679-688.
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You can use the library in a direct way using:
<script src="http://vrivas.es/ts-error-measures/ts-error-measures.js">//Loading ts-error-measures</script>
But you can also download it or fork it.
Look for an example at http://vrivas.es/ts-error-measures/sample.html