var data = [
    [1, 4862.4],
    [2, 5294.7],
    [3, 5934.5],
    [4, 7171.0],
    [5, 8964.4],
    [6, 10202.2],
    [7, 11962.5],
    [8, 14928.3],
    [9, 16909.2],
    [10, 18547.9],
    [11, 21617.8],
    [12, 26638.1],
    [13, 34634.4],
    [14, 46759.4],
    [15, 58478.1],
    [16, 67884.6],
    [17, 74462.6],
    [18, 79395.7]
];

// See https://github.com/ecomfe/echarts-stat
var myRegression = ecStat.regression('exponential', data);

myRegression.points.sort(function(a, b) {
    return a[0] - b[0];
});

option = {
    title: {
        text: '1981 - 1998 gross domestic product GDP (trillion yuan)',
        subtext: 'By ecStat.regression',
        sublink: 'https://github.com/ecomfe/echarts-stat',
        left: 'center'
    },
    tooltip: {
        trigger: 'axis',
        axisPointer: {
            type: 'cross'
        }
    },
    xAxis: {
        type: 'value',
        splitLine: {
            lineStyle: {
                type: 'dashed'
            }
        },
        splitNumber: 20
    },
    yAxis: {
        type: 'value',
        splitLine: {
            lineStyle: {
                type: 'dashed'
            }
        }
    },
    series: [{
        name: 'scatter',
        type: 'scatter',
        emphasis: {
            label: {
                show: true,
                position: 'left',
                color: 'blue',
                fontSize: 16
            }
        },
        data: data
    }, {
        name: 'line',
        type: 'line',
        showSymbol: false,
        smooth: true,
        data: myRegression.points,
        markPoint: {
            itemStyle: {
                color: 'transparent'
            },
            label: {
                show: true,
                position: 'left',
                formatter: myRegression.expression,
                color: '#333',
                fontSize: 14
            },
            data: [{
                coord: myRegression.points[myRegression.points.length - 1]
            }]
        }
    }]
};