Graphs - Graphs of Input Data - Box-Whisker by - Median/Quart./Range

Select Median/Quart./Range from the Graphs - Graphs of Input Data - Box-Whisker by menu to create a box-whisker plot that represents the distribution of categorized values of the currently highlighted variable. When selected, the resulting box plots represent the currently highlighted variable's central tendency and variability for each category of some grouping variable.

In some results spreadsheets, the selection of the grouping variable is predetermined by some global grouping variable (i.e., the grouping variable designated in an analysis dialog). When this is the case, STATISTICA will incorporate the (predetermined) grouping variable name in the appropriate Graphs of Input Data option (e.g., Box-Whisker by Gender). In most other cases, STATISTICA will prompt you to select the grouping variable via the Select Variable dialog.

When you are prompted to select a grouping variable that will be used to categorize the values of the currently highlighted variable, the Select Variable dialog is displayed. Once you have selected the grouping variable from this dialog, another dialog is displayed (Codes dialog) prompting you to enter the values (codes) for the previously specified grouping variable (if you leave the list of codes empty, all distinctive values of the grouping variable will automatically be used). After the codes have been entered, a plot displaying separate box and whisker plots for each category of the grouping variable will be produced.

For this particular type of categorized box plots, the central tendency of the categorized variable is shown in terms of the medians of the categorized values (represented by the smallest boxes in the plot). The spread (variability) in the categorized variable values is represented in this plot by the quartiles (the 25th and 75th percentiles, larger box in the plots) and the minimum and maximum values of the variable (the whiskers in the plots).