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Add polynomial regression type

Chart2 TrendLines01.png

Allow more than one regression line for one series

Chart2 TrendLines02.png

Extrapolating of trend lines

Chart2 TrendLines03.png

  • Trend lines should also allow extrapolating. If data ranges from 1 to 5 but that x axes range from -2 to 10, then the trend line should display from -2 to +10.
  • In Excel, the setting is called forward forecast and backward forecast.
  • covered in

Mean value for X and center of gravity

Chart2 TrendLines04.png

Error bar for X

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