Trendlines Collection Object

SeriesCollection (Series) Trendlines (Trendline)
Border
DataLabel

A collection of all the Trendline objects for the specified series. Each Trendline object represents a trendline in a chart. A trendline shows the trend, or direction, of data in a series.

Using the Trendlines Collection

Use the Trendlines method to return the Trendlines collection. The following example displays the number of trendlines for series one in the chart.

MsgBox myChart.SeriesCollection(1).Trendlines.Count

Use the Add method to create a new trendline and add it to the series. The following example adds a linear trendline to series one in the chart.

With myChart.SeriesCollection(1).Trendlines
    .Add Type:=xlLinear, Name:="Linear Trend"
End With

Use Trendlines(index), where index is the trendline's index number, to return a single TrendLine object. The following example changes the trendline type for series one in the chart. If the series has no trendline, this example will fail.

myChart.SeriesCollection(1).Trendlines(1).Type = xlMovingAvg

The index number denotes the order in which the trendlines are added to the series. Trendlines(1) is the first trendline added to the series, and Trendlines(Trendlines.Count) is the last one added.