gistfile1.js

function normalizeData(data){
	for (entry in data) {
		var deduplicatedEntries = {};
		var originalData = data[entry]['data'];
		for (var i = 0; i < originalData.length; i++) {
			var keyindex = originalData[i][0];
			var value = originalData[i][1];
			deduplicatedEntries[keyindex] = (deduplicatedEntries[keyindex] || 0) + value;
		}
		var deduplicatedArray = [];
		for (var key in deduplicatedEntries) {
			var datapoint = [Number(key), deduplicatedEntries[key]];
			deduplicatedArray.push(datapoint);
		}
		deduplicatedArray.sort(function(a,b){return a[0] - b[0]});	
		data[entry]['data'] = deduplicatedArray;
	}
	return data;
}