Regression

You can access this dialog from the following:

Ribbon: OpenRail Modeling > Regression

Setting	Description
Import Points	Imports horizontal geometry points from an ASCII file via a text wizard.
Create Regression Line	Regression Line from Points - Takes a set of points and puts them into a proper order creating a linestring (regression line). Regression Line from Line - Creates regression line from a 3D linestring. Regression Line from Rails - Creates horizontal centerline geometry from selected left and right rail alignments. Rail Line from Points - Creates a Regression Line from Rail Points for use in Regression Line from Rails. Add Points to Regression Line - Adds horizontal Regression Points to an existing Regression Line.
Curvature Diagram	Horizontal Curvature Diagram - This tool displays a diagram representing curvature along the path of regression points in a horizontal alignment. Vertical Curvature Diagram - This tool displays a diagram representing curvature along the path of regression points in a vertical alignment.
Horizontal Regression	Single Horizontal Regression - Creates a single horizontal geometry element that is a "best fit" to a set of regression points. Quick Horizontal Regression - Makes an initial best guess of all elements (line, circular arc and transition spirals).
Vertical Regression	Single Vertical Regression - Creates a single vertical geometry element that is a "best fit" to a set of regression points. Quick Vertical Regression - Makes an initial best guess of all elements (line, arcs).
Regression Tools	Regression Points Table - Provides tabular display of regression points. Regression Complex Table - Displays the components of the regression complex geometry. Add to Regression Complex - Adds selected geometry to the regression complex. Reset Slew Values - Resets/removes existing slew values to 0.00 for recalculation. Resets slew graphic representation. Change Regression Complex - Replaces the exiting regression complex with the selected geometry complex.
Geometry Tools	Single Element Nudge - Allows the user to move or nudge a single element in a complex geometry. Geometry Connector - Combines multi-element connect, multi-element regression tools and connection editor into one tool. Open Profile Model - Used to generate a View that presents a desired feature in profile thus enabling the Vertical Geometry tools to interact with the chosen feature. Define Profile By Best Fit - Used to construct a profile complex defined by best fitting through a selected profile.
Spirals	Complex Spiral Between - Automatically defines spirals in multiple gaps along the selected complex geometry. Spiral from Element - Used to construct a spiral from a previously places element, using this base element to determine tangency at one end. Rail Spiral Between Elements - Used to construct a spiral (or spirals) between two base elements that determine tangency.
Reports	Regression Report - Creates a Regression Report.