Determination of The Optimum Number of Items to Retain in a Test Measuring a Single Ability  

Oleh:

Bedell, B. J.

Jenis: Article from Journal - e-Journal
Dalam koleksi: Psychometrika: A Journal of Quantitative Psychology vol. 15 no. 4 (Dec. 1950), page 419-430.
Topik: Optimum Number; Test; Single Ability
Fulltext: Determination of The Optimum Number of Items to Retain in a Test Measuring a Single Ability.pdf (442.66KB)

Isi artikel

It should be possible to make a test a more accurate measuring instrument by discarding some of the items which have been found, by item analysis, to be inefficient. If this is so, fresh and more reliable scores from the already marked scripts would be obtained by neglecting the discarded items, and, in the future, the abbreviated test would be used. The present article offers two solutions, based on slightly different premises, to the problem of which items to discard when the test has been designed to measure a single ability. In a practical example these yield almost the same result, which is also the result obtained by a less rigorous grouping method described, which is by no means laborious to use.

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