Plot: Aggregation

In the Graph Options dialog box, select the Aggregation tab (located under Plot) to display the options described here, which are used to modify the existing line plot. Several options are available for changing the display style and adding new components such as whiskers or Japanese candles to the plot.

Plot

Select the plot to which you want to make changes. If you have several plots in one graph, assign names to each plot using the Name field on the Plot: General tab.

Aggregated Data

Use the Aggregated Data group to specify an aggregated line plot, where each plot point is computed as the mean of  k consecutive observations (where k is the Span).

Use Aggregation

Select the Use Aggregation check box to request aggregation of consecutive observations.

Span

If the Use aggregation check box is selected, you can specify in the Span field the number k defining the Span of k consecutive observations from which the plot points (means) will be computed.

Properties

Use the options in the Properties group to specify various additional properties of the (aggregated and/or stacked) line plot.

Stacked

Select the Stacked check box to create a stacked line plot. This check box is only available if more than one variable is represented (plotted) in the current line graph. In that case, the vertical plot positions (along the y-axis) for each consecutive case (plotted along the x-axis) is computed as the cumulative sum over the variables represented in the graph. So for example, if two variables are plotted, and for a particular X value (case) the Y value for the first variable is 2 and for the second variable it is 5, then the vertical (Y) plot positions for the line representing the first variable is 2, and for the second variable 2+5=7. In other words, the lines are stacked one on top the other. Note that only the Standard line Type is available for stacked line plots.

Area not to baseline

When this check box is selected, the plot area will not extend to the X axis, but extends to the line of the preceding plot, i.e., for the first plot, there will be no area at all.

Type

Instead of summarizing the aggregation of values in a single plot point (mean), use the Type drop-down box to show the minimum and maximum values found in each span of consecutive (aggregated) values as Value Range Bars (high-low whiskers), or Japanese candles (boxes); if you select Standard then only the means for each span of consecutive values will be plotted. Note that this option is only available when the Stacked check box is cleared and the Use aggregation check box is selected.

Weight as Case Multipliers

Select the Weight as Case Multipliers check box in order for the (non-aggregated) line plot to use the Case weights as case multipliers, and duplicate points in the graph if they have Case weights w greater than or equal to 2 (the points will be duplicated w times); if this check box is cleared, then Case weights will be ignored in the plot, and each observation will only be used (plotted) once. Case weights will not be used if the Use aggregation check box is selected. Note that this check box is applicable when Case weights are specified for the current analysis or data file, and when the Use aggregation check box is cleared. See Spreadsheet Case Weights or Analysis/Graph Case Weights for further details.

Space between groups

Specify the desired space between groups in the histogram.