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Measurement Precision Test Construction And Best Test Design, Pender J. Pedler
Measurement Precision Test Construction And Best Test Design, Pender J. Pedler
Research outputs pre 2011
This article examines the precision of measurements obtained from using the Rasch Dichotomous Model to analyse test data. Considering tests in which the item difficulties are uniformly spaced from easiest to most difficult, permits the derivation of an alternative expression for the standard error of measurement. This expression is sufficiently simple to enable the precision properties of uniform tests to be readily described and to enable a variety of problems of test construction to be solved. One particular problem is that of best test design. Regarding measurement precision as a property of the test only, we show that the best …
Threshold Order And Likert-Style Questionnaires, Barry Sheridan
Threshold Order And Likert-Style Questionnaires, Barry Sheridan
Research outputs pre 2011
Attention to the structure and sequence order of categories for items employing extended category scoring has not received the attention it deserves in the construction of Likert-style questionnaires. The importance of threshold order is emphasised through the presentation of two examples drawn from actual testing situations. When the "neutral", "not sure" or "uncertain" category is incorporated as part of the scoring function the Likert format, threshold disorder results which demonstrates that this structure is not conducive to sound measurement procedures. The second illustration demonstrates how accounting for extremely unlikely responses in a data set, through an examination of threshold order, …