Examples (ORTHOPLAN command) 

ORTHOPLAN FACTORS=SPEED 'Highest possible speed'
   (70 '70 mph' 100 '100 mph' 130 '130mph')
  WARRANTY 'Length of warranty'
   ('1 year' '3 year' '5 year')
  SEATS (2, 4) /MINIMUM=9 /HOLDOUT=6 /OUTFILE='CARPLAN.SAV'.
  • The FACTORS subcommand defines the factors and levels to be used in building the file. Labels for some of the factors and some of the levels of each factor are also supplied.
  • The MINIMUM subcommand specifies that the orthogonal plan should contain at least nine full-concept cases.
  • HOLDOUT specifies that six holdout cases should be generated. A new variable, STATUS_, is created by ORTHOPLAN to distinguish these holdout cases from the regular experimental cases. Another variable, CARD_, is created to assign identification numbers to the plan cases.
  • The OUTFILE subcommand saves the plan that is generated by ORTHOPLAN as a data file so that it can be used at a later date with CONJOINT.

Example: Appending Plan to the Working File

DATA LIST FREE /SPEED WARRANTY SEATS.
VALUE LABELS speed 70 '70 mph' 100 '100 mph' 130 '130 mph'
 /WARRANTY 1 '1 year' 3 '3 year' 5 '5 year'
 /SEATS 2 '2 seats' 4 '4 seats'.
BEGIN DATA
130 5 2
130 1 4
END DATA.
ORTHOPLAN
 /OUTFILE='CARPLAN.SAV'.
  • In this example, ORTHOPLAN appends the plan to the active dataset and uses the variables and values that were previously defined in the active dataset as the factors and levels of the plan.
  • The data between BEGIN DATA and END DATA are assumed to be simulation cases and are assigned a value of 2 on the newly created STATUS_ variable.
  • The OUTFILE subcommand saves the plan that is generated by ORTHOPLAN as a data file so that it can be used at a later date with CONJOINT.