Create a Formula Column
In JMP, you can create a formula column that combines conditional expressions with value comparisons. Create a Formula Column.jsl shows how to create a new formula column that evaluates ages in Big Class.jmp and returns the result in the new column (图 17.3).
/* Scenario:
How do you create a formula column that combines conditional expressions
with value comparisons? This script shows how to create a new formula
column that evaluates ages in Big Class.jmp and returns the conditional
result in the new column. */
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
/* Create a new character column for the formula.
Insert "early" in the new column if the age is less than or
equal to 12. Insert "mid" if the age is less than or equal to
15 but greater than 12. For ages greater than 15, insert "late".
*/
dt << New Column( "Adolescent Phase",
Character,
Formula(
If( :age <= 12, "early",
12 < :age <= 15, "mid",
"late"
)
)
);
Figure 17.3 Conditional Expression in Formula
