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Table Of Contents
Locking the Intercept at Zero
You can lock the intercept of the movable line at zero.
From the Analyze menu, click Lock Intercept at Zero.
You can unlock the intercept by choosing Unlock Movable Line Intercept
on the Analyze menu.
Tracing a Movable Line
You can trace a movable line to predict and analyze values.
1. Click the line.
The pointer changes.
2. From the Analyze menu, click Graph Trace to enable Trace mode for the
line. Rotation of the line is not supported in Trace mode.
3. Press or (left or right arrow keys) to trace the movable line.
If the plotted variables change, points on the graph and the line are
updated automatically.
Showing a Line of Regression
You can show a line of regression when you have a scatter plot or an X-Y line
plot on the work area. Studying the line of regression can help you understand
the relationship between two variables.
1. With a scatter plot or X-Y line plot of two variables on the work area, click
the Analyze menu, choose Regression and view the list of regressions.
2. Click the type of regression line to show. For example, choose Show
Linear (mx+b) to plot a linear regression line as shown in the following
example.
Data&Statistics Application 387