# Trendlines

Trendlines (or trend lines) are automatically generated indicators that show the overall trends in the series data. They are defined as a special type of series that are linked to the main series by name.

## Trendline Types

The Chart supports the following types of trendlines - Linear Trendline and Moving Average Trendline.

### Linear Trendline

A linear trendline is usually used to show if a particular quantity is increasing or decreasing in time.

The following example demonstrates how to create a linear trendline for Categorical series.

``````    <div id="chart"></div>
<script>
\$("#chart").kendoChart({
series: [
{
name: "World",
data: [15.7, 16.7, 20, 23.5, 26.6]
},
{
name: 'Sales Forecast (LINEAR)',
type: 'linearTrendline', // linearTrendline, movingAverageTrendline
for: 'World',
color:"lime"
}
],
tooltip: {
visible: true,
shared: true
},
categoryAxis: {
categories: [2005, 2006, 2007, 2008, 2009]
}
});
</script>
``````

### Moving Average Trendline

The moving average trendline is used to smooth out the variations in the data by averaging all points in a period. By default, the period is set to `2` chart intervals.

The following example demonstrates how to create a moving average trendline for Categorical series.

``````    <div id="chart"></div>
<script>
\$("#chart").kendoChart({
series: [
{
name: "World",
data: [15.7, 16.7, 20, 23.5, 26.6]
},
{
name: 'Sales Forecast (Moving AVG.)',
type: 'movingAverageTrendline', // linearTrendline, movingAverageTrendline
for: 'World',
color:"lime"
}
],
tooltip: {
visible: true,
shared: true
},
categoryAxis: {
categories: [2005, 2006, 2007, 2008, 2009]
}
});
</script>
``````

## Data Binding

Trendline series use the data from the main series and do not support binding to a different data set.

### Date Series and Aggregates

If the main series is using `aggregates`, as is most common for Date Series, the trendlines will bind to the aggregated data. For example, if you're using a `"sum"` aggregate, the trendline will plot the trend for the sums in each category.

## Supported Series Types

Trendlines are supported for the following chart types:

• `"area"`
• `"bar"`
• `"boxPlot"`
• `"bubble"`
• `"bullet"`
• `"candlestick"`
• `"column"`
• `"horizontalWaterfall"`
• `"line"`
• `"ohlc"`
• `"pie"`
• `"polarArea"`
• `"polarLine"`
• `"polarScatter"`
• `"radarArea"`
• `"radarColumn"`
• `"radarLine"`
• `"rangeArea"`
• `"rangeBar"`
• `"rangeColumn"`
• `"scatter"`
• `"scatterLine"`
• `"verticalArea"`
• `"verticalBoxPlot"`
• `"verticalBullet"`
• `"verticalLine"`
• `"verticalRangeArea"`
• `"waterfall"`