Research Article
The Effects of Reusing Written Test Items: A Study Using the Rasch Model
Table 2
Students’ fluctuation between test days and mean standard deviation of ability measure.
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cw: calendar week 2009; : number of persons taking the test as a pretest; : number of students assigned; : number of students staying as assigned; : number of students joining; : number of students assembled with different motivations (pretest takers only); ability measure: Rasch-based ability measure; first test date: students taking test on day 1, not motivated to benefit from leaked item content; follow-up test date as scheduled: students who had the opportunity to benefit from leaked content but did not bother to increase this opportunity; strategic reschedulers: students who increased their opportunity to benefit from item leakage by rescheduling to the latest possible test date. |