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In the JSFiddle provided in previous reply, calculateTrendLine method calculates trend-line dynamically based on dataPoints passed to chart, irrespective of source of dataPoints. Please refer this stackexchange thread for more info on calculating trend-line / Y=mx+b.

If adding calculateTrendLine method doesn’t work in your case, kindly share sample project with sample database over Google-Drive or Onedrive, so that we can look into your code, understand it better and help you out.

Vishwas R
Team CanvasJS