conjoint syntax

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conjoint syntax

E. Bernardo
I encountered trouble in running the syntax below. 
 
CONJOINT PLAN 'c:\eins\Design2.sav'
   /DATA  'c:\eins\dataforanalysis.sav'
   /RANK = com_1 to com_12
   /SUBJECT=academe
   /FACTORS CurrOff(discrete) Tuition(discrete less) Location Program Prof Instruction Facility ClassSched
   /PLOT ALL.
 
The same syntax is doing well for my first data.  However, it fails for my second data.  Academe in the subject command is a group variable with 2 categories (academe, non-academe).  I am very surprised why the outputs in my second dataset are by subject within each category  Sample titles of outputs look like as follows:
Subject 1: Academe
Subject 2: Non-academe
Subject 3: Academe
....
....
...
Subject n: non-academe
 
Further more, the outputs show the reversal statistics.
What are these reversals?
 
Thank you in advance..
Eins


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