Table 10.5 Item most-unexpected observations

Table 10.5 displays the item response strings with the most-unexpected responses.


MOST UNEXPECTED RESPONSES                                            

ACT                       MEASURE  |KID                              

                                   |414 2377166764321 35324  14 13725



    18 GO ON PICNIC         -3.15 D|...........0....1....1....1......

    19 GO TO ZOO            -2.48 H|.......0..........1..1...........

    20 WATCH BUGS            1.83 C|.......2...2....2..........1..21.

    23 WATCH A RAT           2.18 A|1.0....2.2.....2.......22.211122.

     5 FIND BOTTLES AND CANS 2.42 B|.0.....2.2....2.....2.212.112..11



                                   |175 5341957324575 25667  49 20293


In this Table, the items (rows) are sorted by measure, ascending.


The persons (columns) are sorted by measure, descending. The most-able person (highest-scoring) is on the left. The person entry-numbers are in each column (vertically). In the Figure, the first is person 41. The persons shown are those with the most-unexpected responses. UCOUNT= sets the maximum number of persons to report. LINELENGTH= controls the width of the table. "high" indicates where we expect to see high observations. "low" indicates where we expect to see low observations. Expected observations are replaced by ".'.


Each row contains:

Item entry number

Item label

Item measure

Item letter (A-Z) in the plot in Table 10.1.

The responses to the items:

0, 1, 2 and numeric values

Scored unexpected-responses

Expected responses, standardized residuals < |2|


Missing data


The 26 items with the most-unexpected individual responses are shown, excluding those with no unexpected responses on the displayed items.

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Rasch Publications
Rasch Measurement Transactions (free, online) Rasch Measurement research papers (free, online) Probabilistic Models for Some Intelligence and Attainment Tests, Georg Rasch Applying the Rasch Model 3rd. Ed., Bond & Fox Best Test Design, Wright & Stone
Rating Scale Analysis, Wright & Masters Introduction to Rasch Measurement, E. Smith & R. Smith Introduction to Many-Facet Rasch Measurement, Thomas Eckes Invariant Measurement with Raters and Rating Scales: Rasch Models for Rater-Mediated Assessments, George Engelhard, Jr. & Stefanie Wind Statistical Analyses for Language Testers, Rita Green
Rasch Models: Foundations, Recent Developments, and Applications, Fischer & Molenaar Journal of Applied Measurement Rasch models for measurement, David Andrich Constructing Measures, Mark Wilson Rasch Analysis in the Human Sciences, Boone, Stave, Yale
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