V3: XY Bubble simple

HTML

<script src="http://www.amcharts.com/lib/3/amcharts.js"></script>
<script src="http://www.amcharts.com/lib/3/xy.js"></script>
<div id="chartdiv" style="width: 100%; height: 362px;"></div>

JavaScript

var chart;

var chartData = [
    {
        "x": 10,
        "y": 14,
        "value": 59
    },
    {
        "x": 5,
        "y": 3,
        "value": 50
    },
    {
        "x": -10,
        "y": -3,
        "value": 0
    },
    {
        "x": -6,
        "y": 5,
        "value": 65
    },
    {
        "x": 15,
        "y": -4,
        "value": 92
    },
    {
        "x": 13,
        "y": 1,
        "value": 8
    },
    {
        "x": 1,
        "y": 6,
        "value": 35
    },
    {
        "x": -10,
        "y": 10,
        "value": 50
    }
];

AmCharts.ready(function () {
    // XY Chart
    chart = new AmCharts.AmXYChart();
    chart.pathToImages = "../amcharts/images/";
    chart.dataProvider = chartData;
    chart.startDuration = 1.5;
    
    // AXES
    // X
    var xAxis = new AmCharts.ValueAxis();
    xAxis.title = "X Axis";
    xAxis.position = "bottom";
    xAxis.autoGridCount = true;
    chart.addValueAxis(xAxis);
    
    // Y
    var yAxis = new AmCharts.ValueAxis();
    yAxis.title = "Y Axis";
    yAxis.position = "left";
    yAxis.autoGridCount = true;
    chart.addValueAxis(yAxis);
    
    // GRAPH
    var graph = new AmCharts.AmGraph();
    graph.valueField = "value"; // valueField responsible for the size of a bullet
    graph.xField = "x";
    graph.yField = "y";
    graph.lineAlpha = 0;
    graph.bullet = "bubble";
    graph.balloonText = "x:<b>[[x]]</b> y:<b>[[y]]</b><br>value:<b>[[value]]</b>"
    chart.addGraph(graph);
    
    // WRITE                                
    chart.write("chartdiv");
});