Wright maps can be very useful in large-scale assessments, providing information
that is not readily available through numerical score averages and other
traditional summary information—they are used extensively, for example, in
reporting on the PISA assessments [PISA 2005a]. A Wright map illustrating
the estimates for the Rasch model is shown in Figure 4. On this map, an “X”
represents a group of students, all at the same estimated achievement level. The
logits (on the left-hand side) are the units of the Wright map—they are related
to the probability of a student succeeding at an item, and are specifically the log
of the odds of that occurring. The symbols “T,” “N” and “A” each represent a
Technical Processing, Numerical Modeling, and Abstract Modeling item, with
the Topic Area indicated by the column headings above. Where a student is
located near an item, this indicates that there is approximately a 50% chance of
the student getting the item correct. Where the student is above the item, the chance is greater than 50%, and the further it is above, the greater the chance.
Where the student is lower than the item, the chance is less than 50%, and the
further it is below, the lesser the chance. Thus this map illustrates the description
Wright maps can be very useful in large-scale assessments, providing informationthat is not readily available through numerical score averages and othertraditional summary information—they are used extensively, for example, inreporting on the PISA assessments [PISA 2005a]. A Wright map illustratingthe estimates for the Rasch model is shown in Figure 4. On this map, an “X”represents a group of students, all at the same estimated achievement level. Thelogits (on the left-hand side) are the units of the Wright map—they are relatedto the probability of a student succeeding at an item, and are specifically the logof the odds of that occurring. The symbols “T,” “N” and “A” each represent aTechnical Processing, Numerical Modeling, and Abstract Modeling item, withthe Topic Area indicated by the column headings above. Where a student islocated near an item, this indicates that there is approximately a 50% chance ofthe student getting the item correct. Where the student is above the item, the chance is greater than 50%, and the further it is above, the greater the chance.Where the student is lower than the item, the chance is less than 50%, and thefurther it is below, the lesser the chance. Thus this map illustrates the description
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