To connect the data points as they are plotted, checkmark CONNECT in the second page of the Plot Setup. This is not a regression curve.

Fitting a curve to 2VAR data

In the Plot view, press . This draws a curve to fit the checked two-variable data set(s). See “To choose the fit” on page 8-12.

Correlation coefficient

The expression in Fit2 shows that the slope=1.98082191781 and the y- intercept=2.2657.

The correlation coefficient is stored in the CORR variable. It is a measure of fit to a linear curve only. Regardless of the Fit model you have chosen, CORR relates to the linear model.

Relative Error

The relative error is a measure of the error between

 

predicted values and actual values based on the specified

 

Fit. A smaller number means a better fit.

 

The relative error is stored in a variable named RELERR.

 

The relative error provides a measure of fit accuracy for

 

all fits, and it does depend on the Fit model you have

 

chosen.

Statistics aplet

8-17