Area

In Graph Builder, the Area element shows a contiguous area that represents the area beneath summary statistic values of a variable across the values or categories of another variable. Consider the Area element as a continuous representation of the Bar element.

Note: You can also create an area plot using the Line element .

• Both variables might be nominal or ordinal. The summary statistic represents the count of observations in a level of the variable on the axis that is not specified as the Response Axis.

• One of the variables might be continuous and the other nominal or ordinal. The summary statistic represents the value of the specified summary statistic for the continuous variable for the corresponding level of the categorical variable.

• If both variables are continuous, the summary statistic is computed for the continuous variable on the axis that is specified as the Response Axis.

Note: The plot is not affected in any way if rows are hidden and not excluded.

For an example of a graph that uses the Area element, see Example of an Area and Line Chart.

Figure 3.32 Area Options 

Area Style

Changes how the area is displayed when there are merged variables on the response axis. For area style descriptions, see Table 3.2.

Row order

Connects points with line segments in the order of their row numbers.

Connection

Changes the connection type to a line, curve, step, centered step, horizontal, or vertical line. If you select a curve, you can also change the smoothness.

Summary Statistic

Specifies the statistic that is plotted. The statistic is computed for observations at each distinct value of the variable in the X zone (or the Y zone, if X is specified as the Response Axis).

Error Interval

Adds or removes specified error interval in the graph.

Interval Style

Draws error bars, error bands, or hash bands for the selected error interval.

Missing Factors

Provides options for connections when all values are missing for a setting of the variable on the X axis:

Skip

Skips over the missing factor value, connecting the previous factor to the next factor.

Treat as Missing

Skips over the missing factor value, connecting the previous factor to the next factor. Draws the connection in the style specified for Missing Values.

Treat as zero

Treats the missing factor values as zero.

Missing Values

Provides options for connections when all values are missing for a setting of the variable on the Response axis:

Connect Through

Connects the points adjacent to the missing values with the connector type used for the remaining points.

Connect Faded

Connects the points adjacent to the missing values with a faded connection.

Connect Dashed

Connects the points adjacent to the missing values with a dashed connection.

No Connection

Shows no connection between the points adjacent to the missing values.

Variables

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

Note: These options do not apply to variables in the 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:

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

– 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.

For an example using Variables, see Example of an Area and Line Chart.

Red Triangle Options for Area

Response Axis

Specifies the axis for the variable that is used as the response in plotting the areas. Available only when both variables have a Continuous modeling type. If only one variable is Continuous, its axis is the response axis. The Auto setting is the Y axis.

Save Summary Formula

Saves the formula for the summary statistics to the data table.

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