How to find and extract Inflection Point of fitted lines

Steps to Find Inflection Point

1.  Use Scatterplot to display x & y

2.  Apply Logistic Regression Fit

• Properties-->Lines & Curves-->Add-->Logistic Regression Curve Fit...

  • (Optional) If grouped by color: Check (One per: Color)

     

(select/highlight) Inflection Point -->Label & Tooltips (button)...-->(check/enable) Y50, Log10(X50)

(select/highlight) Inflection Point -->More (button) -->Export Curve Fit Result...

Once the data is exported, it can then be loaded back into Spotfire.

Below I am attaching an example DXP file.

how_to_extract_inflection_point.dxp