﻿ Table 29 Empirical ICCs and option frequencies

# Table 29 Empirical ICCs and option frequencies

A subtable of plots is shown for each item. The subtables are numbered by Item Entry number. These plots only appear if there is something to show.

 EMPIRICAL & MODEL ICCs : 1. WATCH BIRDS        -+-----+-----+-----+-----+-----+-----+-----+-----+-----+-      2 +          x          xxxxxx xx x x..*...*.......*......+        |                           .......                     | O      |                        ...                            | B      |                    x...                               | S      |                 x  .                                  | E      |              x   ..                                   | R  1.5 +                x.                                     + V      |               ..                                      | E      |              .   xx                                   | D      |             .                                         |        |            .                                          | A      |           .x                                          | V    1 +    xx x x.  x x                                       + E      |        ..                                             | R      |       .                                               | A      |      .    x                                           | G      |     .                                                 | E      |    .                                                  |     .5 +  ..                                                   + S      | .                                                     | C      |.                                                      | O      |                                                       | R      |                                                       | E      |                                                       |      0 +  x   x                                                +        -+-----+-----+-----+-----+-----+-----+-----+-----+-----+-        -2    -1     0     1     2     3     4     5     6     7                 KID MEASURE EMPIRICAL & MODEL ICCs This Table displays, as dots, the model expected score ogive, also called the predicted Item Characteristic Curve (ICC) and the predicted Item Response Function (IRF). The model ICC is shown by '.'. this is the expected average score on the item for persons at each measure relative to the item.   The empirical observed average score per measure, the empirical ICC, is shown by x's. Observed average scores on the items are shown by 'x'. When '.' and 'x' coincide, '*' is shown.   You can use this plot to compute the empirical item discrimination. EMPIRICAL CODE FREQUENCIES: "C"  : 2. 2        ++------+------+------+------+------+------+------+------++    100 +                                                         +     96 +.......                                                  + F   92 +       ....                                              + R   88 +           ..                                            + E   84 +             ..                                          + Q   80 +               ..                                        + U   76 +                 ..                                      + E   72 +                   .                                     + N   68 +                    .                                    + C   64 +                     ..                                  + Y   60 +                       .                                 +     56 +                        .                                + O   52 +                         .                               + F   48 +                          .                              +     44 +                           .                             + R   40 +                            .                            + E   36 +                             ..                          + S   32 +                     C         .                         + P   28 +               C C              .                        + O   24 +                    C    C       ..                      + N   20 +            C          C           ..                    + S   16 +      C                   C CC  C    ..                  + E   12 +                              C        ..                + %    8 +                                  CC     ....            +      4 +                                             ........    +      0 +                                                     ....+        ++------+------+------+------+------+------+------+------++        -4     -3     -2     -1      0      1      2      3      4                               PERSON MEASURE EMPIRICAL CODE FREQUENCIES: multiple-choice items This shows the relative frequency of each item response code for each measure level.   For a multiple-choice item, with C as an incorrect distractor, this could like the plot below. The dots are the Rasch ogive for an incorrect answer. EMPIRICAL CODE FREQUENCIES: "1" Neutral : 1. WATCH BIRDS        -+-----+-----+-----+-----+-----+-----+-----+-----+-----+-    100 +    NN N N   N N                                       +     96 +                                                       + F   92 +                                                       + R   88 +                                                       + E   84 +            N                                          + Q   80 +                                                       + U   76 +           N                                           + E   72 +                                                       + N   68 +                  NN                                   + C   64 +                                                       + Y   60 +                                                       +     56 +          .                                            + O   52 +       ... ...  N                                      + F   48 +     ..       .                                        +     44 +    .          ..                                      + R   40 +  ..             .                                     + E   36 + .            N   .                                    + S   32 +.                N .                                   + P   28 +                    .                                  + O   24 +                    N..                                + N   20 +                       .                               + S   16 +                        ..                             + E   12 +                          ..                           + %    8 +                            ....                       +      4 +                                .......                +      0 +                                       ................+        -+-----+-----+-----+-----+-----+-----+-----+-----+-----+-        -2    -1     0     1     2     3     4     5     6     7                 KID MEASURE EMPIRICAL CODE FREQUENCIES: polytomies For a polytomous item, the percentage frequencies of responses, and the model ordinal probability, of each category are shown at each measure level. The dots are the model curve. "N" is the empirical frequency for category N = Neutral.

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