# TrendLine Collection Editor ## Content The **TrendLine Collection Editor** is used for adding or modifying TrendLines that approximate the data which the functions trend at design time. For more information on TrendLines see, [Working with TrendLines](/componentone/docs/win/online-chart2d/chartingdata/workingwithtrendline). ### To Access the TrendLine Collection Editor 1. Right-click the **C1Chart** control and select **Properties** from its context menu. 2. In the Properties window, expand the **ChartGroups** node, then expand the **Group0** or **Group1** node. 3. Expand the **ChartData** node, then click on the **ellipsis** button next to the **TrendsList** property. The **TrendLine Collection Editor** appears.
![](https://cdn.mescius.io/document-site-files/images/70bd33a2-280e-4cc3-a1c0-7b827eceb8aa/imagesext/trendlinecollectioneditor.png) DOC-DETAILS-TAG-OPEN DOC-SUMMARY-TAG-OPEN Properties available in the TrendLine Collection Editor DOC-SUMMARY-TAG-CLOSE The following properties are available for the user in the **TrendLine Collection Editor** at design time or they can be used in the [TrendLine](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.TrendLine.html) class at run time: **Misc Properties of the TrendLine Collection Editor**: | **Members** | **Description** | | --- | --- | | [DataArray](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.TrendLine.DataArray.html) | Gets or sets the array of y values that is used for the trendline. | | [LegendEntry](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.TrendLine.LegendEntry.html) | Gets or sets whether the trendline appears in the legend. | | [Period](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.TrendLine.Period.html) | Gets or sets period for Moving Average trendline. | | [RegressionOptions](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.TrendLine.RegressionOptions.html) | Gets the options for regression calculation. | | [NumTerms](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.RegressionOptions.NumTerms.html) | Gets or sets the number of terms in regression equation. Only for polynomial and fourier trend lines. | | [UseYIntercept](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.RegressionOptions.UseYIntercept.html) | Gets or sets whether the trend line uses Yintercept property. Only for polynomial trend line. | | [YIntercept](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.RegressionOptions.YIntercept.html) | Gets or sets the y value at which trend line intercepts x =0 line. Only for polynomial trend line. | | [Coeffs](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.RegressionStatistics.Coeffs.html) | Gets the coefficients of regression equation. | | [DF](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.RegressionStatistics.DF.html) | Gets the degrees of freedom. | | [F](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.RegressionStatistics.F.html) | Gets the F-observed(F-statistic) value. | | [Rsq](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.RegressionStatistics.Rsq.html) | Gets the coefficient of determination(R-squared). | | [Sey](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.RegressionStatistics.Sey.html) | Gets the standard error for the y estimate. | | [Sse](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.RegressionStatistics.Sse.html) | Gets the sum of squares due to error. | | [Ssr](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.RegressionStatistics.Ssr.html) | Gets the sum of squares due to regression. | | [SeriesIndex](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.TrendLine.SeriesIndex.html) | Gets or sets the data series index that is used for trendline plotting. | | [SeriesLabel](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.TrendLine.SeriesLabel.html) | Gets the data series label that is used for trendline plotting. | | [Text](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.ICustomTrendLine.Text.html) | Gets or sets the text that will be shown in legend. | | [TrendLineType](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.TrendLine.TrendLineType.html) | Gets or sets the type of trendline. | **Plot Properties of the TrendLine Collection Editor**: | **Members** | **Description** | | --- | --- | | [ForecastBackward](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.TrendLine.ForecastBackward.html) | Gets or sets how long the trendline extends comparing series data minimum. | | [ForecastForward](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.TrendLine.ForecastForward.html) | Gets or sets how long the trendline extends comparing series data maximum. | | [LineStyle](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.TrendLine.LineStyle.html) | Gets or sets the line used to plot the TrendLine. | | [Color](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.ChartLineStyle.Color.html) | Gets or sets the color of the line. | | [Pattern](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.ChartLineStyle.Pattern.html) | Gets or sets the pattern of the line. | | [Thickness](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.ChartLineStyle.Thickness.html) | Gets or sets the thickness of the line. | | [PlotLinesMethod](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.TrendLine.PlotLinesMethod.html) | Gets or sets the method of trendline plotting. | | [PlotNumPoints](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.TrendLine.PlotNumPoints.html) | Gets or sets the number of points of trendline plotting. | | [PlotOverData](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.TrendLine.PlotOverData.html) | Gets or sets whether the trendline is plotted over or behind data. | | [Visible](/componentone/api/win/online-chart2d/dotnet-framework-api/C1.Win.C1Chart.4.8/C1.Win.C1Chart.TrendLine.Visible.html) | Gets or sets whether the trendline is visible. | DOC-DETAILS-TAG-CLOSE ## See Also [ValueLabel Collection Editor](/componentone/docs/win/online-chart2d/designtimesupport/c1chartcollectionedi/valuelabelcollection)