Bar | JMP 13.2

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Essential Graphing • Graph Builder • Element Types and Options • Bar

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The Bar element

shows a bar chart of summary statistic values of one or more variables across the values or categories of one or more stratifying variables. The graph can display a single variable or multiple variables of any type arranged in the X and Y zones.

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If you add a single categorical variable, then each bar shows the count of observations in the corresponding level of the variable.

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If you add two variables, with one in each zone, each bar represents the value of the specified summary statistic for the variable on the specified Response Axis. There is a bar for each value or level of the stratifying variable.

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If you add multiple variables in each zone, multiple bars are plotted for each value or combination of levels of the stratifying variables.

Response Axis Variables with Character Data Type

If the variable on the Response Axis has the Character modeling type, then this variable is assigned numeric values as follows:

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Integer values are assigned based on the Value Ordering column property or the default value ordering.

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These integer values range from 0 (highest level in value ordering) to the number of levels minus one (lowest value in value ordering).

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These integer values are used in calculating the Summary Statistic.

Note: If any of the rows used in constructing a bar on the plot are hidden and not excluded, the bar is not shown, but the position that it would occupy remains.

For an example of a graph that uses the bar element, see Example of a Stacked Bar Chart in Graph Builder Examples.

You can change the appearance of the bars that describe the levels of the stratifying variable. Many bar styles are applicable only when there are merged variables on the response axis, or if an overlay variable is present. For bar style descriptions, see Bar Styles and Descriptions.

Specifies the axis for the variable that is used as the response in plotting the bars. This option is available only when each axis contains at least one variable with a Continuous modeling type. If only one variable is Continuous, its axis is the response axis. The Auto setting is the Y axis.

Summary Statistic

Specifies the statistic that is plotted at each level of the stratifying variables. The Summary Statistic is computed for the values of the variables on the response axis.

Adds or removes error bars in the graph. All error bars are available when the Mean is selected as the Summary Statistic. Only Range bars are available for the Median. No error bars are available otherwise.

Adds or removes labels of various types in the bar chart.

Shows or hides graph elements for variables, or re-orders the display of variables.

Note: These options do not apply to variables in the Overlay, Group X, Group Y, Wrap, or Page zones.

Check boxes are followed by the zone designation and the name of the variable. Use check boxes to do the following:

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Show or hide the elements corresponding to a variable in a zone.

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Add or remove the effect of applying the Color, Size, Shape, or Freq variable to the variable in the zone.

Tip: If you have multiple graphs, you can color or size each graph by different variables. Drag a second variable to the Color or Size zone, and drop it in a corner. In the Variables option, select the specific color or size variable to apply to each graph.

Use arrows to re-order the display if there are multiple variables in a zone. Highlight a variable name and click an arrow to reposition it.

Bar Styles and Descriptions

When you have two or more merged variables on the response axis, a bar is plotted for each of the merged variables. The bars are arranged next to each other for each level of the stratifying variables. They are colored and a legend appears.

When you have two or more merged variables on the response axis, a single bar is plotted for each level of the stratifying variables. Each bar stacks the bars for each of the merged variables. The part of the bar corresponding to each merged variable is colored and a legend appears.

When you have two or more merged variables on the response axis, a narrow bar is plotted within a wider and taller bar. The widths of the bars depend on the order of the variables. The part of the bar corresponding to each merged variable is colored and a legend appears.

If you have only a single variable, this style plots narrow bars.

When you have two or more merged variables on the response axis, the bars for each variable are nested within each other. The narrowest bar corresponds to the first variable listed in the legend, the next narrowest to the second, and so on.

Tip: You can change the legend order using the arrows in the Variables panel.

When you have two or more merged variables on the response axis, a rectangle and a line are plotted for each level of the stratifying variables. For each level of the stratifying variables:

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The values of the summary statistic are calculated for each of the merged variables.

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A rectangle is plotted with bounds equal to the summary statistic values for the first two of variables, as indicated in the legend.

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Lines are plotted at the values of the summary statistic for the other variables.

When you have two or more merged variables on the response axis, a line with boundaries and a circle is plotted for each level of the stratifying variables. For each level of the stratifying variables:

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The values of the summary statistic are calculated for each of the merged variables.

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A line with boundaries is plotted with bounds equal to the summary statistic values for the first two of variables, as indicated in the legend.

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A circle is plotted at the overall values of the summary statistic for the other variables.

For each level of the stratifying variables, a bar is plotted. When you have two or more merged variables on the response axis, the bar represents the value of the summary statistic for the first variable in the legend and lines are shown for the values of the summary statistic for the remaining variables.

Tip: You can change the legend order using the arrows in the Variables panel.

When you have two or more merged variables on the response axis, line segments are plotted at the levels of the stratifying variables. For each level of the stratifying variables:

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The values of the summary statistic are calculated for each of the merged variables.

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A line segment connecting the summary statistic values for two of the variables, as indicated in the legend.

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Bars are plotted at right angles to the line segment at the remaining values of the summary statistic.

When you have two or more merged variables on the response axis, box plots are shown for the levels of the stratifying variables. For each level of the stratifying variables:

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The values of the summary statistic are calculated for each of the merged variables.

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An outlier box plot is constructed for these values.

When you have two or more merged variables on the response axis, needle-shaped bars are plotted side-by-side for each of the merged variables. The bars are colored and a legend appears. This style is useful when you have many levels of the stratifying variables.

When you have two or more merged variables on the response axis, bars are plotted at the levels of the stratifying variables. For each level of the stratifying variables:

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The values of the summary statistic are calculated for each of the merged variables.

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A bar is plotted at each of these values.

This style is useful when you have many merged variables.

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Help created on 9/19/2017