The Error Bar chart type consists of lines with markers that are used to display statistical information about the data displayed in a graph. A series of the Error Bar chart type has three Y values. While these values can be manually assigned to each point, in most cases, the values are calculated from the data present in another series. The order of the Y values is important because each position in the array of values represents a value on the error bar.
Adding Error Bar series to another series on same chart
Lets say we have a chart named Chart1 and series named Series1.
We can add the Error Bar series to Series1 using the following snippet…
.
Series errorBarSeries = new Series(“ErrorBar”);
errorBarSeries.ChartType = SeriesChartType.ErrorBar;
errorBarSeries.MarkerBorderColor = Color.FromArgb(64, 64, 64);
errorBarSeries.MarkerSize = 6;
errorBarSeries.YValuesPerPoint = 3;
errorBarSeries.BorderColor = Color.FromArgb(180, 26, 59, 105);
errorBarSeries.Color = Color.FromArgb(252, 180, 65);
errorBarSeries.ShadowOffset = 1;
errorBarSeries.MarkerStyle = MarkerStyle.None;
errorBarSeries[“PointWidth”] = “0.1”;
double error = 100;
foreach (DataPoint point in Series1.Points)
{
double centerY = point.YValues[0];
double lowerErrorY = centerY – error;
double upperErrorY = centerY + error;
errorBarSeries.Points.AddXY(point.XValue, centerY, lowerErrorY, upperErrorY);
}
Chart1.Series.Add(errorBarSeries);
.
Calculating Error Values from Another Series
This can be done using the following code snippet.
// Populate series with data
double[] yValues = {32.4, 56.9, 89.7, 98.5, 59.3, 33.8, 78.8, 44.6, 76.4, 68.9};
Chart1.Series[“DataSeries”].Points.DataBindY(yValues);
// Set error bar chart type
chart1.Series[“ErrorBar”].ChartType = SeriesChartType.ErrorBar;
// Link error bar series with data series
Chart1.Series[“ErrorBar”][“ErrorBarSeries”] = “DataSeries”;
// Set error calculation type
Chart1.Series[“ErrorBar”][“ErrorBarType”] = “StandardError”;
// Set error bar upper & lower error style
Chart1.Series[“ErrorBar”][“ErrorBarStyle”] = “UpperError”;
// Set error bar center marker style
Chart1.Series[“ErrorBar”][“ErrorBarCenterMarkerStyle”] = “Circle”;
