Log Crossplot Data Options tab

The Options tabs sets a couple of additional options for the Cross Plot Module.

How to Determine Default Scale Ranges

This option simply governs how Petra populates the scale ranges on the X-Y Axes tab and Ternary tab when a curve is added for the first time.  By default, Petra uses the user-set default ranges established in the Main Module’s Logs tab.  Alternatively, Petra can conduct a statistical measurement of the curves.

Create Regression Report

This option creates a regression report called “xplot_regression.txt” in the project’s PARMS directory.   This report contains statistical measurements of the relationship between the X and Y axes, as well as a regression linear equation.  While inside the Log Crossplot Module, select CTRL + R to quickly open this report.

REGRESSION REPORT

Jul 1, 2010  10:10 AM

X = GR

Y = ILD

LINEAR REGRESSION

N = 266

SUM X = 27227.29900

SUM Y = 27227.29900

SUM X^2 = 3078851.23372

SUM Y^2 = 171.41121

ssx = 291912.09524

ssy = 20.44893

r1 = -2082.67644

r2 = 5969289.15957

Corr Coef = -0.85243

Slope = -0.00837

Y-Int = 1.61005

Std Error = 0.15120

Equation: LOG(ILD) = (-0.00836969)*GR + 1.6101