Using JMP - SAS

Chapter 8 Summarize Data 243
Tabulate Data
• N provides the number of nonmissing values in the column. This is the default statistic when there is no
analysis column.
• Sum is the sum of all values in the column. This is the default statistic for analysis columns when there
are no other statistics for the table.
• Quantiles gives the value at which the specific percentage of the argument is less than or equal to. For
example, 75% of the data is less than the 75th quantile. You can request different quantiles by clicking
and dragging the Quantiles keyword into the table, and then entering the quantile into the box that
appears.
• % of Total computes the percentage of total of the whole population. The denominator used in the
computation is the total of all the included observations, and the numerator is the total for the category.
If there is no analysis column, the % of Total is the percentage of total of counts. If there is an analysis
column, the % of Total is the percentage of the total of the sum of the analysis column. Thus, the
denominator is the sum of the analysis column over all the included observations, and the numerator is
the sum of the analysis column for that category. You can request different percentages by dragging the
keyword into the table.
– Dropping one or more grouping columns from the table to the % of Total heading changes the
denominator definition. For this, Tabulate uses the sum of these grouping columns for the
denominator.
– To get the percentage of the column total, drag all the grouping columns on the row table and drop
them onto the % of Total heading (same as Column %). Similarly, to get the percentage of the row
total, drag all grouping columns on the column table and drop them onto the % of Total heading
(same as Row %).
• Column % is the percent of each cell count to its column total if there is no analysis column. If there is
an analysis column, the Column % is the percent of the column total of the sum of the analysis column.
• Row % is the percent of each cell count to its row total if there is no analysis column. If there is an
analysis column, the Row % is the percent of the row total of the sum of the analysis column.
• All is a special keyword for grouping columns. It is used when you want to aggregate summary
information for categories of a grouping column.
Example Using the All Keyword
Suppose one of the grouping columns in a table is Sex with two categories, F and M. Add the keyword All to
create a third category that aggregates the statistics for both F and M.
1. Open the Big Class.jmp sample data table.
2. Select Tables > Tabulate.
3. Click sex and drag and drop it into the Drop zone for columns.
4. Click Mean and drag and drop it into the blank cell next to the number 18.
5. Click height and drag and drop it just below Mean.
6. Select Add Analysis Columns.
7. Click All and drag and drop it in the column name sex.