Add a calculated line to a graph, to identify a target, a theoretical relationship between variables, or a trend. Unlike reference lines, which are horizontal or vertical lines that are at a single value on one scale, calculated lines can be sloped lines or complex polylines.

To add a calculated line to a graph, choose Editor > Add > Calculated Line, then enter two columns that contain the X- and Y-coordinates that define the line. For example, the following time series plot includes a calculated line that represents sales goals. The values in the Y and X columns specify the coordinates for the endpoints of the three line segments.

C1 C2 C3
Sales Y X
210 200 2
205 350 8
202 450 16
245 500 24

You cannot update calculated lines. If you change the coordinate values, you must delete the existing calculated line and add a new calculated line based on the new coordinate values.

To edit a calculated line, double-click it. You can edit the following items.
Change line attributes
Double-click the calculated line to change the color, size, line type, or arrow style. For example, on the following histogram, the calculated line has a custom color and line type.
Change units

Minitab tracks the location of calculated lines using a coordinate system. The coordinates can be in data units, which are relative to the graph scales, or figure units, which are relative to the figure region. (Usually, the figure region covers the entire graph.) Because calculated lines are defined by data units, normally, you would not change to figure units. To change the units, double-click the calculated line. On the Units tab, select Switch coordinate system from data units to figure units.

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