Bell Curves in Sisense

I was able to simplify the script.

You no longer require the "Median" and "SD" values.
Just configure the following variables:

• dataLabel - Your data series name
• sdLevels - The number of SD levels to display (1 means -1/+1 l 2 means -2/-1/+1/+2) | etc.)

var debug = true;

function getMedian(sorted) {
    const middle = Math.floor(sorted.length / 2);

    if (sorted.length % 2 === 0)
        return (sorted[middle - 1] + sorted[middle]) / 2;
    else
		return sorted[middle];
}

function getStandardDeviation(numArray) {
  const mean = numArray.reduce((s, n) => s + n) / numArray.length;
  const variance = numArray.reduce((s, n) => s + (n - mean) ** 2, 0) / (numArray.length - 1);
  return Math.sqrt(variance);
}

function getAxisLocation(rangeArray,value) {
	// Calculates the {value} relative location on the {rangeArray} axis
    for (let i=1 ; i< rangeArray.length; i++) {
        if (parseFloat(rangeArray[i-1]) <= value && value <= parseFloat(rangeArray[i])) {
			// If within the range of the datapoints [i-1] and [i]
            return (i-1) + (value-parseFloat(rangeArray[i-1])) / parseFloat((rangeArray[i])-rangeArray[i-1]);
        }
    }
	
	// The value isn't within the axis range
    return -1;
}


widget.on('processresult',function(w,ev) {

	var widgetID = w._id;
	var sdLevels = 2;
	var dataLabel = 'Frequency';
	
	//scan the "Values"
	$.each(ev.result.series, function(i, v) {
		switch(v.name) {
			case dataLabel:
				valueArray = [];
				for (let i = 0 ; i< v.data.length ; i++) {for (let j = 0 ; j < v.data[i].y ; j++ ) {valueArray.push(parseFloat(ev.result.xAxis.categories[i]))}};
				MedianVal = getMedian(valueArray);
				if (debug) console.log (widgetID + ' - Found "Median" with a value of ' + MedianVal);
				StdevPVal = getStandardDeviation(valueArray);
				if (debug) console.log (widgetID + ' - Found "Population StDev" with a value of ' + StdevPVal);
				break;
		}
	});
	
	// Fix highcharts bug that prevents showing vertical line labels
	// Details: https://github.com/highcharts/highcharts/issues/8477
	Highcharts.wrap(Highcharts.Axis.prototype, 'getPlotLinePath', function(proceed) {
		var path = proceed.apply(this, Array.prototype.slice.call(arguments, 1));
		if (path) {
			path.flat = false;
		}
		return path;
	});
	
	// Initialize the vertical lines array
	ev.result.xAxis.plotLines = [];
	
	// Add the vertical lines
	for (let i=-sdLevels;i<=sdLevels; i++) {
		Value = MedianVal + i * StdevPVal
		Position = getAxisLocation(ev.result.xAxis.categories,Value);
		
		if (debug) console.log (widgetID + ' - Handling i=' + i +' Value=' + Value + ' Position=' + Position)
		
		switch (Math.abs(i)) {
			case 0:
				Color = 'Red'
				Text = 'Median (' + Value.toFixed(2) + ')'
				break;
			case 1:
				Color = 'Blue'
				Text = i + 'SD (' + Value.toFixed(2) + ')'
				break;
			case 2:
				Color = 'Grey'
				Text = i + 'SD'
				break;
		}
			

		if (Position != -1) ev.result.xAxis.plotLines.push(
			{
				color: Color,
				width: 2,
				dashStyle: "dash",
				value: Position,
				label: {
					text: Text,
					rotation:0,
					textAlign: "center",
					style:{fontFamily: "abelregular"},
					y:15,
					x:-3
				}
			})
		else
			if (debug) console.log (widgetID + ' - The "SD ' + i +'" line is out of the X Axis range (' + Value + ') - Skipping')
	}
})

Hi Silutions 

Looking at your script - You're missing a "break;" in your case statement: