Movable Linear Fit
The
Movable Linear Fit is used to manually draw a linear regression over
the selected area of a graph and display the slope (m) and y-intercept
(b) of that line.
Perform a Movable Linear Fit
- To
perform a movable linear fit, click and drag across a region of
interest. The shaded area contains the selected data upon which the
movable linear fit will be calculated. If a region is not selected, the
movable linear fit will be calculated for all data displayed in the
graph.
- Choose Model from the Analyze menu. and choose the equation type Linear.
- A helper object containing the slope, y-intercept, and RMSE of the line will be added to the graph.
- Double click on the helper object and select the option for Enable Line Drag.
- The
movable linear fit can now be adjusted by dragging one of the three
handles on the line. The center handle adjusts the Y-intercept, the
outer two handles can be used to rotate the line about the far edge. If
the X axis is scaled from zero, then the right handle will control the
slope while leaving the Y-intercept alone.
- To remove the movable linear fit, click the X in the upper corner of the helper object.
See Also: