Comparing t Test, Rit Significance Test, and Rit Criteria for Item Selection Method: A Simulation Study  

Oleh:

Santoso, Agung

Jenis: Article from Journal - ilmiah nasional - terakreditasi DIKTI
Dalam koleksi: Anima Indonesian Psychological Journal vol. 32 no. 2 (Jan. 2017), page 99-108.
Topik: item-total correlation; item discrimination; item selection; korelasi butir-total; daya diskriminasi butir; seleksi butir
Fulltext: document(3)_Ros.pdf (558.89KB)

Isi artikel

Three criteria of items selection have been widely used despite of their limitations without any empirical evidence to support its practice. Current study examined the three criteria to determine which of the three criteria were the best among the others. Those criteria were the item total correlation, its significance by t-test and significance of . Simulations were conducted to demonstrate which of the three criteria provided the least errors in both ex-cluding good items and including bad items in the scale. The author manipulate four condi-tions in conducting simulation study: (a) number of items in a scale; (b) value of in po-pulation; (c) sample sizes; and (d) criteria in including or excluding items in a scale. The re-sults showed that criteria of provided the least errors of including bad items and excluding good items, particularly when . The two criteria based on significance test provided the largest errors therefore were not recommended in future practice.

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