Table 2.6 Observed average measures of persons (empirical averages)

(controlled by T2SELECT=, MRANGE=, CATREF=)

 

Table 2 for multiple-choice items.

Table 2 for polytomous items.

 

OBSERVED AVERAGE MEASURES FOR KID (unscored) (BY OBSERVED CATEGORY)

-5   -4    -3    -2    -1     0     1     2     3     4     5

|-----+-----+-----+-----+-----+-----+-----+-----+-----+-----|  NUM   TAP

|                          0                        1       |   15  1-3-2-4-1-3

|                          0                        1       |   16  1-4-2-3-1-4

|                          0                        1       |   17  1-4-3-1-2-4

|                                                           |

|                                                           |

|                          0         1                      |   14  1-4-2-3-4-1

|                                                           |

|                        0              1                   |   12  1-3-2-4-3

|                       0                   1               |   13  1-4-3-2-4

|                                                           |

|                     0               1                     |   11  1-3-1-2-4

|                                                           |

|                                                           |

|               0                1                          |   10  2-4-3-1

|                                                           |

|         0                      1                          |    8  1-4-2-3

|                                                           |

|         0                    1                            |    6  3-4-1

|    0                         1                            |    9  1-3-2-4

|      0                      1                             |    5  2-1-4

|            0                1                             |    7  1-4-3-2

|   0                         1                             |    4  1-3-4

|-----+-----+-----+-----+-----+-----+-----+-----+-----+-----|  NUM   TAP

-5   -4    -3    -2    -1     0     1     2     3     4     5

 

                            1

1   1   2   2    2    3     2       5     4    1    2          KID

 T            S             M            S            T

0      10       20   30    60      80    90        99          PERCENTILE

 

 

In Table 2, when Winsteps discovers that two or more category numbers display in the same place,  it places the first category number correctly, then it places the next category numbers in the nearest empty print positions. This can be misleading to the eye.

Suggestion: spread the observed averages in Table 2 using the instruction, say,

LINELENGTH=120

so that there is less chance that category numbers will display in the same place.

 

Table 2.6, shown first from the Diagnosis menu, shows the average measures from Table 14.3 of the persons choosing each distractor. "m" usually indicates the average measure of persons with missing data. Table 2.6 shows the average ability of the group of examinees who chose each option. Table 2.15 (above) shows the average ability of the people who got an item right and wrong. Table 2.5 (above again) has the right and wrong scoring illustrated with specific MCQ options. If there are more than one correct or incorrect option, only one of each is shown.

 

TABLE 2.6 OBSERVED AVERAGE MEASURES FOR STUDENTS (unscored) (BY OBSERVED CATEGORY)

-4    -3     -2     -1      0      1      2      3      4

|------+------+------+------+------+------+------+------|  NUM   TOPIC

|                         m    ab     c                 d   55  al07  newspaper

|                          m                d        c  |   64  sa01  magazine

 Code for unidentified missing data: m

 

Table 2.16 is the same as Table 6, but the options are shown by their scored values, not by their codes in the data.

 

TABLE 2.16 OBSERVED AVERAGE MEASURES FOR STUDENTS (unscored) (BY CATEGORY SCORE)

-4    -3     -2     -1      0      1      2      3      4

|------+------+------+------+------+------+------+------|  NUM   TOPIC

|                         m    00     0                 1   55  al07  newspaper

|                          m                0        1  |   64  sa01  magazine

 

---

 

Polytomous items

 

Tables 2.6 & Table 2.16 plot the observed average person measures from Table 14.3 for each observed category. It reflects how this sample used these categories. The plotted values cannot fall outside the range of the sample. "m" in the plot indicates the average measure of those for whom their observation is missing on this item. This Table is shown first from the Diagnosis pull-down menu.

 

OBSERVED AVERAGE MEASURES BY OBSERVED CATEGORY FOR PUPILS

-2     -1       0       1       2       3       4       5

|-------+-------+-------+-------+-------+-------+-------|  NUM   ACT

|                       000102                          |    5  FIND BOTTLES AND CANS

|                                                       |

|                       000102    m                     |   23  WATCH A RAT

|                                                       |

|                   00  01         02                   |   20  WATCH BUGS

|                 00    01               02             |    4  WATCH GRASS CHANGE

|                   0001                02              |    8  LOOK IN SIDEWALK CRACKS

|-------+-------+-------+-------+-------+-------+-------|  NUM   ACT

-2     -1       0       1       2       3       4       5

  Code for unidentified missing data: m

 

   1 2  11 2 114346533233332222 322 2 1 1 1  1  1      11  PUPILS

    T        S         M         S         T