Cumulative Sum

The Cumulative Sum tool sums (cumulates) all the previous values with the current value in a visible range.

For the following data: [10, 8, 15, 20, 8, 15] the Cumulative Sum returns [10, 18, 33, 53, 61, 76] (see the graph below):

The cumulative can be enabled in the chart’s options using the series.cumulative  property or enabled/disabled by the series.setCumulative()  method or on all the series belonging to a specific y-axis by the yAxis.setCumulative()  method.

With dataGrouping enabled, default grouping approximation  is set to sum.