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Visual Discrimination Of Letters In The Alphabet By Young Children: A Rasch Measurement Analysis
ECU Publications Pre. 2011
  • Janet Richmond, Edith Cowan University
  • Russell Waugh, Edith Cowan University
Publication Date
Document Type
Conference Proceeding
Faculty of Computing, Health and Science
School of Exercise, Biomedical & Health Science / Fogarty Learning Centre

This article was originally published as:
Richmond, J. E., & Waugh, R. F. (2009). Visual discrimination of letters in the alphabet by young children: A Rasch measurement analysis. Proceedings of AARE Canberra Conference 2009. (pp. 1-28). Canberra. AARE.


Data on 30 items for upper case letters and 36 items for lower case letters, where each item was scored in one of two categories (wrong scored zero and correct scored one), were Rasch analysed to create two linear scales . The student sample was N=324 pre-primary and primary students (aged 5 to 9 years) in Perth, Western Australia. Twelve of the initial 30 items of Visual Discrimination of Upper Case Letters were deleted due to item misfit statistics leaving 18 items and five of the original 36 items for Visual Discrimination of Lower Case Letters were deleted leaving 31 items. The 18 item-scale and the 31 item-scale each had a good fit to the measurement model, were reliable (Person Separation Indices of 0.55 and 0.82 and Cronbach Alphas of 0.70 and 0.82), and were unidimensional, showing no statistically significant interaction on item difficulties along the scale. Items were ordered from easy to hard and student measures from low to high on the same scale, allowing the objective identification of alphabet letters that students found difficult to discriminate. Students who had poor visual discrimination skills of alphabet letters could also be identified objectively.

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Citation Information
Janet Richmond and Russell Waugh. "Visual Discrimination Of Letters In The Alphabet By Young Children: A Rasch Measurement Analysis" (2009)
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