In general, Cronbach alpha value gives us test reliability, but does not tell us if we have problem with
the person or the item. Nevertheless, by using Rasch measurement model, it can inform us about the
person reliability and item reliability. Person reliability refers to the reproducibility of each person’s sequence of order if they are given another set of items assessing the same construct . Based on the rating scale instrument quality criteria, the person reliability in this study was relatively poor, i.e. 0.43. To increase the person reliability, the students’ ability range ought to be widened and more items of test should be added. The value of person separation was below 0.86 (below 1.0). Hence, it showed that the students could not be well -distinguished
In general, Cronbach alpha value gives us test reliability, but does not tell us if we have problem withthe person or the item. Nevertheless, by using Rasch measurement model, it can inform us about theperson reliability and item reliability. Person reliability refers to the reproducibility of each person’s sequence of order if they are given another set of items assessing the same construct . Based on the rating scale instrument quality criteria, the person reliability in this study was relatively poor, i.e. 0.43. To increase the person reliability, the students’ ability range ought to be widened and more items of test should be added. The value of person separation was below 0.86 (below 1.0). Hence, it showed that the students could not be well -distinguished
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