Estimating the Reliability of Dichotomous or Trichotomous Scores  

Oleh:

Feldt, Leonard S.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Educational and Psychological Measurement vol. 65 no. 1 (Feb. 2005), page 28-41.
Topik: reliability coefficient; dichotomous score reliability; trichotomous score reliability; parallel-forms reliability
Fulltext: 28.pdf (105.94KB)

Isi artikel

To meet the requirements of the No Child Left Behind Act, school districts and states must compile summary reports of the levels of student achievement in reading and mathematics. The levels are to be described in broad categories: “basic and below,” “proficient,” or “advanced.” Educational units are given considerable latitude in defining the percentile limits of these categories and the measures to be used in assessing the levels of each student. However, they must defend the validity and reliability of these measures. The question arises: Howdoes one estimate the reliability of a score generated by a test of k items after the score is reduced to three or even two values?Aprecise solution, based on normality assumptions, requires the application of computer programs inaccessible to most local educators. Tables are provided in this article that enable local educators to deduce the reliability of broad-category scores (?yy') from the reliability of the original scores (?xx').

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