UEXTREME= include extreme scores for UIMEAN= or UPMEAN= No

In unanchored analyses, the item difficulties are centered by UIMEAN= or the person abilities are centered by UPMEAN=.

 

UEXTREME = No (the default). Do not include items or persons with extreme scores (minimum possible or maximum possible) when computing the centering.

 

UEXTREME = Yes. Do include items or persons with extreme scores (minimum possible or maximum possible) when computing the centering.

 

Example: using Exam1..txt

 

UIMEAN=0 and UEXTREME=No (items with extreme scores excluded when setting the local origin at zero)

 

     SUMMARY OF 14 MEASURED (NON-EXTREME) TAP

-------------------------------------------------------------------------------

|          TOTAL                         MODEL         INFIT        OUTFIT    |

|          SCORE     COUNT     MEASURE   ERROR      MNSQ   ZSTD   MNSQ   ZSTD |

|-----------------------------------------------------------------------------|

| MEAN      16.9      35.0         .00     .71       .96     .0    .68    -.1 |

| P.SD      12.9        .0        3.48     .21       .28     .7    .58     .5 |

| MAX.      32.0      35.0        4.80    1.07      1.56    1.2   2.21    1.1 |

| MIN.       1.0      35.0       -4.40     .45       .59   -1.3    .11    -.6 |

|-----------------------------------------------------------------------------|

 

     SUMMARY OF 18 MEASURED (EXTREME AND NON-EXTREME) TAP

-------------------------------------------------------------------------------

|          TOTAL                         MODEL         INFIT        OUTFIT    |

|          SCORE     COUNT     MEASURE   ERROR      MNSQ   ZSTD   MNSQ   ZSTD |

|-----------------------------------------------------------------------------|

| MEAN      18.9      35.0        -.76     .96                                |

| P.SD      14.0        .0        4.26     .51                                |

| MAX.      35.0      35.0        6.13    1.85                                |

| MIN.        .0      35.0       -6.59     .45       .59   -1.3    .11    -.6 |

|-----------------------------------------------------------------------------|

 

 
UIMEAN=0 and UEXTREME=YES (items with extreme scores included when setting the local origin at zero)

 

     SUMMARY OF 14 MEASURED (NON-EXTREME) TAP

-------------------------------------------------------------------------------

|          TOTAL                         MODEL         INFIT        OUTFIT    |

|          SCORE     COUNT     MEASURE   ERROR      MNSQ   ZSTD   MNSQ   ZSTD |

|-----------------------------------------------------------------------------|

| MEAN      16.9      35.0         .75     .71       .96     .0    .68    -.1 |

| P.SD      12.9        .0        3.46     .21       .27     .7    .57     .5 |

| MAX.      32.0      35.0        5.53    1.07      1.55    1.2   2.16    1.1 |

| MIN.       1.0      35.0       -3.63     .45       .59   -1.4    .11    -.6 |

|-----------------------------------------------------------------------------|

| REAL RMSE    .77 TRUE SD    3.38  SEPARATION  4.40  TAP    RELIABILITY  .95 |

|MODEL RMSE    .74 TRUE SD    3.38  SEPARATION  4.57  TAP    RELIABILITY  .95 |

| S.E. OF TAP MEAN = .96                                                      |

-------------------------------------------------------------------------------

 

     SUMMARY OF 18 MEASURED (EXTREME AND NON-EXTREME) TAP

-------------------------------------------------------------------------------

|          TOTAL                         MODEL         INFIT        OUTFIT    |

|          SCORE     COUNT     MEASURE   ERROR      MNSQ   ZSTD   MNSQ   ZSTD |

|-----------------------------------------------------------------------------|

| MEAN      18.9      35.0         .00     .96                                |

| P.SD      14.0        .0        4.24     .50                                |

| MAX.      35.0      35.0        6.86    1.84                                |

| MIN.        .0      35.0       -5.80     .45       .59   -1.4    .11    -.6 |

|-----------------------------------------------------------------------------|

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