WellCAD Basics - Advanced Logic Technology

1.8.4.2 Regression Data Source
1.8.4.3 Regression Display Options
BOOK 1 - WELLCAD BASICS - 221
The Data Source tab of the Regression
Settings dialog box provides a tree
control listing all plots, classifications
and clusters available in the cross-plot
chart.
By checking the plots (listed by their
given plot title) and clusters (name
derived from assigned lithology pattern)
you can specify which data points will be
considered by the regression algorithm.
In the example shown in the figure
above all points from Plot 1 and Plot 2 Regression Settings Data Source selection
falling into Cluster 1 will be taken into
account. If color and/or symbol classifications have been applied to the data a
further level will be available in the tree control allowing the restriction of cross
plotted points down to a single class.
The different tools in the Options tab
allow settings with respect to the
presentation of the regression line and
its details. Note that the Legend
options are only available in the Print
Layout view explained in the Layout
and Formatting paragraph.
The Pen color, style and width settings
determine the appearance of the
regression line. Its length, usually limited
through the lowest and highest data
point taken into account, can be
extended using the Extend controls.
Settings related to the presentation of the
regression line.
The Legend section (only in the Print
Layout view) contains a number of options that can be hidden or displayed in the
legend belonging to a certain regression line. E.g. the display of the equation
determined from the least squares fit can be displayed or hidden. An example is
shown below.