You can plot two different kinds of fitted lines on a scatter plot: the least-squares line and the median-median line (see What Is a Median-Median Line?).
1. Select the graph.
2. Choose Graph | Least-Squares Line or Graph | Median-Median Line.
The corresponding line appears on the graph, and its equation appears below the plot area. Choose the command again to remove the line.
· You can force a least-squares line to go through the origin by choosing Graph | Lock Intercept at Zero.
Note: The least-squares and median-median lines update dynamically as the data change. (Drag a data point to see whether it influences the line.)
When you have a multiattribute scatter plot (more than one attribute on a given axis), you get a line and equation for each.
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