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@kerrith,
It is possible to create a new dataPoints array by summing up/subtracting each y value of the first 2 dataPoints array as shown below –
function createThirdDataSeries() { for(var i = 0; i < dps1.length; i++) { dps3.push({x: dps1[i].x, y: dps1[i].y + dps2[i].y}) } }
You can create a multi-series area chart by providing each of these dataPoints array as separate dataSeries.
Kindly take a look at this JSFiddle for an example on creating a multi-series area chart with the third dataSeries being the sum of the first two dataSeries.
Also, kindly take a look at this forum thread for your reference.
___________ Adithya Menon Team CanvasJS