Edit Scale - Secondary
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Select scale > Editor > Edit Scale > Secondary

You can specify that variables on a given axis are associated with a primary or secondary scale. By default, when overlaying two or more graph models, Minitab creates x- and y-scales that accommodate the full range of all variables on each axis. However, if the ranges of values for two variables are, for example, 0–10 and 500–1000, a scale that includes their collective range may not be appropriate for either. You can then assign these variables to primary and secondary scales to display different scales on the low and high side of the axis. You can only apply secondary scales to the continuous scales of overlaid scatterplots or time series plots, except when paneling is also applied.

Without Secondary Scale

With Secondary Scale

The two overlaid graphs share a common y-axis variable, but their y-axis variables have very different ranges. One set of variables in particular is difficult to interpret and is ill-suited to the use of common scales.

Here a secondary scale has been added. Both graphs still share the y-axis, but with independent x-axes the data region is used more effectively.

Dialog box items

Variable: Lists each variable represented on the selected axis. Does not take input.

Scale

Primary: Choose to associate the variable with the primary scale.

Secondary: Choose to associate the variable with the secondary scale.

The tabs that appear depend on the active graph.

<Show>

<Attributes>

<Labels>

<Transform>

<Font>

<Alignment>

<Type>