starting average work

public/app.js

@@ -11,6 +11,8 @@ let yAxis = 'outcomes'
 let bottomAxis;
 let leftAxis;
 let zoomScale = 1
+let averageOutcomes = []
+let sortedInstances;
 
 const randomColor = ()=>{
 	const red = Math.floor(Math.random()*128) + 64;
@@ -261,6 +263,23 @@ const setUpZoomPan = ()=>{
 	d3.select('#container').call(zoom);
 }
 
+const getAverage = (start, end) => {
+	let sum = 0
+	for(let i = start; i < end; i++){
+		sum += sortedInstances[i].ninety_day_outcomes/sortedInstances[i].graduates*100
+	}
+	averageOutcomes.push({average:sum/(end-start), initialGraduationDate:sortedInstances[start].graduation_date})
+}
+
+const displayMeanStandardDeviation = () => {
+	sortedInstances = instances.sort((a,b) => Date.parse(a.graduation_date) - Date.parse(b.graduation_date))
+
+	for(let i = 0; i < sortedInstances.length-10; i += 10){
+		getAverage(i,i+10)
+	}
+	console.log(averageOutcomes);
+}
+
 window.onload = async ()=>{
 	instances = await d3.json('/instances');
 	for(let instance of instances){
@@ -282,4 +301,6 @@ window.onload = async ()=>{
 	createFormSubmissionHandler();
 	createRadioButtonHanlders();
 	setUpZoomPan();
+
+	displayMeanStandardDeviation();
 }