series.trendline.order Number (default: 2)

The order (degree) of the Polynomial trendline. The default value is 2.

The period setting is supported only when series.type is set to "polynomialTrendline".

Accepted values are from 2 to 6:

• 2: a Quadratic polynomial trendline with a single extreme point (minimum or maximum) point.
• 3: a Cubic polynomial trendline with up to 2 extreme points.
• 4: a polynomial trendline of 4th degree with up to 3 extreme points.
• 5: a polynomial trendline of 5th degree with up to 4 extreme points.
• 6: a polynomial trendline of 6th degree with up to 5 extreme points.

Example - set the polynomial trendline order (degree)

<div id="chart"></div>
<script>
$("#chart").kendoChart({
    dataSource: {
        data: [
        {
            period: "2021 Q1",
            count: 369590.0
        },
        {
            period: "2021 Q2",
            count: 793564.0
        },
        {
            period: "2021 Q3",
            count: 1441133.0
        },
        {
            period: "2021 Q4",
            count: 1233020.0
        }
        ]
    },
    series: [{
        name: "Sales By Quarter",
        type: "line",
        field: "count",
        categoryField: "period"
    }, {
        name: "Sales Trend",
        type: "polynomialTrendline",
        for: "Sales By Quarter",
        trendline: {
            order: 3
        }
    }]
});
</script>