Moving Average

The wijmo.chart.analytics module contains classes that extend the Series class to provide extra information about the data including: trend lines, moving averages, error bars, box and waterfall plots, and function plots.

The MovingAverage class extends the regular Series class to provide a series of averages of different subsets of the full data set.

To add moving averages to a chart, follow these steps:

1. Create one or more MovingAverage series,
2. Configure the MovingAverage series as you would regular series, setting their binding, chartType, and style properties for example, and
3. Set the MovingAverage's type and period properties to determine the type of moving average you want to create.

Example:

import * as chart from '@grapecity/wijmo.chart';
import * as analytics from '@grapecity/wijmo.chart.analytics';

// create a MovingAverage and add it to the Chart series collection
var movingAvg = new analytics.MovingAverage();
movingAvg.name = 'Moving Average';
movingAvg.itemsSource = myChart.itemsSource;
movingAvg.binding = 'sales';
movingAvg.type = 'Simple';
movingAvg.period = 6;
movingAvg.style = { stroke: 'darkred', strokeWidth: 3 };
myChart.series.push(movingAvg);

Supported moving average types:

• Simple: An average of the last n values.
• Weighted: Weighted average of the last n values, where the weight decreases by 1 with each previous value.
• Exponential: Weighted average of the last n values, where the weight decreases exponentially with each previous value.
• Triangular: Weighted average of the last n values, whose result is equivalent to a double smoothed simple moving average.

Display Options for Moving Averages

The MovingAverage class is supported like a series in FlexChart. You can choose whether or not the line displays an entry in the legend by setting the visibility property to one of the following:

• Visible: The series is visible on the plot and in the legend.

• Plot: The series is visible only on the plot.

• Legend: The series is visible only in the legend.

• Hidden: The series is hidden.

  The legend text is set using the name property of the series.