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Chapter 8 Summarizing Data 265
Summarizing Columns
Using one or more grouping columns
If you want the statistics summarized by group, highlight the column(s) you want to be your grouping
variables and click Group to move the variable into the grouping variables list. See “Example of Adding
a Statistics Column,” p. 268, for an example. If you add only grouping variables, the summary table
shows a count for each group.
To change the order that the values of the grouping variables will be listed (ascending or descending
order), select a variable in the grouping variable list and click the ascending/descending buttons
( ). The icon beside the variable changes to indicate the sorting order.
To add marginal statistics (for the grouping variables) to the output columns, click the box beside
Include marginal statistics. In addition to adding marginal statistics for each grouping variable, JMP
adds a row at the end of the table that shows the summary statistics for the whole table. Figure 8.3
shows the summary table for grouping variables Type and Size Co with marginal statistics.
Figure 8.3 Summary Table with Marginal Statistics
8 Summarizing Data
Using quantile statistics
To add specific quantile statistics, type the desired quantile value (%) for the first quantile (for example,
25) in the box under For quantile statistics.
Changing the format of the statistics column name
To change the format of the statistics column name, select from one of the formats in the statistics
column name format drop-down menu. Figure 8.4 shows the available options. By default, the form is
statistic(source column), where statistic is the selection made on the summary window, and source
column is the column from the source table selected in the summary window.
Figure 8.4 Change the Way the Column Name Appears
To create a two-way table of summary statistics by adding a subgroup variable
1 Highlight the column(s) you want to be the nested variable(s). These will be your “subgroup
variable(s).”
2 Click SubGroup to move the variable(s) into the subgroup list.
3 Highlight the column for which you want statistics summarized by subgroup.
4 Click OK.