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Chapter 7 Reshaping Data 245
Joining Data Tables
Option in JMP
By Row Number
Cartesian Join
By Matching Columns
Description
Joins the two tables side by side.
Joins two tables using a Cartesian fashion, where it forms a new table
consisting of all possible combinations of the rows from two original
tables. JMP crosses the data in the first table with the data in the
second to display all combinations of the values in each set.
When you select this option, the window expands, prompting you to
select columns whose values and data types must match in both tables
for rows to be joined. You should:
1 Highlight a column name from each list in the Source Columns
area. The first highlighted column in the top list pairs with the
first highlighted column in the bottom list, the second columns
are paired, and so on. Rows join only if values and data types
match for all the column pairs.
2 Click Match. The selected pair of columns are displayed in the
Match columns box. Matching columns do not have to have the
same names and do not have to be in the same relative column
position in both tables.
3 (Optional) To only include the first match found, check the boxes
associated with Drop multiples in both tables. Only the first
match found is written to the new table. If you specify this option
for one table, the first match value is joined with all matches in the
other table. If you do not check the boxes associated with Drop
multiples in either table, a Cartesian join is performed within each
group of matching column values.
4 (Optional) To include all rows from the data table, even when
there is no matching value, check the boxes associated with
Include non-matches. You can specify this option for either or
both data tables being joined.
7 Reshaping Data
5 Type the name of the new table in the text box beside Output table name.
6 Consult the following table to further specify how to combine the data tables:
Option in JMP
Select Columns for joined
table
Description
Select the Select Columns for joined table option if you want
to select a subset of columns from either table for inclusion in
the output table. Follow these steps:
1 In the Source Columns area, highlight the columns from
each table that you want to include in the new table.
2 Click Select in the Output Columns area.