Stuck with Y-Axis Mapping

<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="utf-8">
		<title>Loading CSV Data with D3</title>
		<script type="text/javascript" src="https://d3js.org/d3.v3.js"></script>
		<style type="text/css">

body	{
				background-color: #FDD8FF;
				font-family: Arial;
				font-size: 25px;
				text-align: center;

}
		
			p {
				font-size: 40px;
				text-align: left;
			}

svg {
				background-color: #FDD8FF;
				fill: gray;
			}

.axis path,
			.axis line {
				fill: none;
				stroke: black;
				shape-rendering: crispEdges;
			}

.axis text {
				font-family: sans-serif;
				font-style: 11px;
			}

rect:hover	{
				fill: #79007F;
			}

g.bar text {
				fill: black;
				font-size: 10px;
				text-anchor: end;
			}
			
		</style>
	</head>
	<body>
		<p>Hospitals' Productive Hours per Patient, CA 2013</p>

var w = 400;
			var h = 800;
			var padding = [ 20, 10, 30, 150 ] //top, right, bottom, left

var widthScale = d3.scale.linear()
								.range([0, w - padding[1] - padding[3] ]);

var heightScale = d3.scale.ordinal()
								.rangeRoundBands([ padding[0], h - padding[2] ], 0.1);

var colorScale = d3.scale.ordinal()
								.domain(["Sacramento", "Alameda", "Los Angeles"])
								.range(["orange", "blue", "green"]);

var xAxis = d3.svg.axis()
							.scale(widthScale)
							.orient("bottom");

var yAxis = d3.svg.axis()
							.scale(heightScale)
							.orient("left");

var svg = d3.select("body")
						.append("svg")
						.attr("width", w)
						.attr("height", h);

d3.csv("hospitalStaffing.csv", function(data) {

data.sort(function(a, b) {
					return d3.descending(+a.ProductiveHoursPatient, +b.ProductiveHoursPatient);
				});

widthScale.domain([ 0, d3.max(data, function(d)	{
					return +d.ProductiveHoursPatient;
				}) ]);

heightScale.domain(d3.range(data.length));
				console.log(heightScale.domain());

var groups = svg.selectAll("g.bar")
								.data(data)
								.enter()
								.append("g")
								.attr("class", "bar");

groups.append("rect")
					.attr("x", padding[3])
					.attr("y", function(d, i) {
						return heightScale(i);
					})
					.attr("width", function(d) {
						return widthScale(d.ProductiveHoursPatient);
					})
					.attr("height", heightScale.rangeBand())
					.attr("fill", function(d) {
						return colorScale(d.County);
					});

groups.append("text")
					.attr("x", padding[3] - 3)
					.attr("y", function(d, i) {
						return heightScale(i) + 10;
					})
					.text(function(d) {
						return d.County;
					});

groups.append("title")
					.text(function(d) {
						return d.Facility + ": " + d.ProductiveHoursPatient;
					});

svg.append("g")
					.attr("class", "x axis")
					.attr("transform", "translate(" + padding[3] + "," + (h - padding[2]) + ")")
					.call(xAxis);

// svg.append("g")
				// 	.attr("class", "y axis")
				// 	.attr("transform", "translate(" + (padding[3] - 5) + ",0)")
				// 	.call(yAxis);

});

</script>

</body>
</html>

Modified http://d3js.org/d3.v3.js to a secure url

https://d3js.org/d3.v3.js