PREFSCAL

PREFSCAL is available in SPSS® Statistics Professional Edition or the Categories option.

PREFSCAL performs multidimensional unfolding of proximity data to find a least-squares representation of the row and column objects in a low-dimensional space.

PREFSCAL VARIABLES = varlist

   [/INPUT = [ROWS({n    })]
                   {rowid}
             [SOURCES({1**     })]]
                      {n       }
                      {sourceid}

   [/PROXIMITIES = {DISSIMILARITIES**}]
                   {SIMILARITIES     }

   [/WEIGHTS = varlist]

   [/INITIAL = {CLASSICAL[({TRIANGLE**})]}]
                           {SPEARMAN  }
               {CORRESPONDENCE           }
               {ROSSCLIFF                }
               {CENTROIDS[({1})]         }
                           {n}
               {RANDOM[({1})]            }
                        {n} 
               {(filespec) [varlist]     }

   [/CONDITION = {ROW** }]
                 {MATRIX}
                 {UNCONDITIONAL    }

   [/TRANSFORMATION = {NONE[(INTERCEPT)]                              }]
                      {LINEAR[(INTERCEPT)]                            }
                      {ORDINAL[({UNTIE   })]                          }
                                {KEEPTIES}**
                      {SMOOTH[({UNTIE   })]                           }
                               {KEEPTIES}
                      {SPLINE[([INTERCEPT] [ORDER={2}] [INKNOT={1}])]}
                                                  {n}          {n}

   [/MODEL = {IDENTITY** }]
             {WEIGHTED   }
             {GENERALIZED}

   [/RESTRICTIONS = {ROW   ({NONE**     } (filespec) [varlist])}]
                            {COORDINATES}
                    {COLUMN({NONE**     } (filespec) [varlist])}
                            {COORDINATES}

   [/PENALTY = [LAMBDA({0.5**})]
                       {value}
               [OMEGA({1.0**})]
                      {value}

   [/CRITERIA = [DIMENSIONS({2**      })]
                            {min[,max]}
                [MAXITER({5000**})]
                         {value }
                [DIFFSTRESS({0.000001**})]
                            {value    }
                [MINSTRESS({0.0001**})]]
                           {value   }

   [/PRINT = [NONE]  [INPUT]  [MULTIPLE]  [INITIAL]
             [HISTORY]  [MEASURES**]  [DECOMPOSITION]
             [COMMON**]  [DISTANCES]  [WEIGHTS**]
             [INDIVIDUAL]  [TRANSFORMATION]]

   [/PLOT = [NONE]  [MULTIPLE]  [INITIAL]  [STRESS]
            [COMMON**]  [WEIGHTS**]
            [INDIVIDUAL[(valuelist) [...]]]
            [TRANSFORMATIONS[(valuelist) [...]]]
            [SHEPARD[(valuelist) [...]]]
            [FIT[(valuelist) [...]]]
            [RESIDUALS[(valuelist) [...]]]]

   [/OPTIONS = [MARKERS(rowid)]
               [COLORS(rowid)]]

   [/OUTFILE = [COMMON('savfile'|'dataset')]
               [WEIGHTS('savfile'|'dataset')]
               [DISTANCES('savfile'|'dataset')]
               [TRANSFORMATIONS('savfile'|'dataset')]]

* Default if the keyword is omitted.

** Default if the subcommand or keyword is omitted.

This command reads the active dataset and causes execution of any pending commands. See the topic Command Order for more information.

Syntax for the PREFSCAL command can be generated from the Multidimensional Unfolding (PREFSCAL) dialog.

Release History

Release 14.0

• Command introduced.

Example

PREFSCAL var01 TO var02.