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ERIC Number: EJ745774
Record Type: Journal
Publication Date: 2006
Pages: 23
Abstractor: Author
Reference Count: 14
ISSN: ISSN-0013-1644
Methods in Scaling the Basic Competence Test
Chang, Shun-Wen
Educational and Psychological Measurement, v66 n6 p907-929 2006
This study evaluates the effects of employing the linear, normalizing, and arcsine transformation methods for constructing scale scores on the Basic Competence Test (BCTEST). Tests in three subject areas (Chinese, English, and Mathematics) were studied using the data of test administrations from 2001 to 2003. The resulting scale scores for each test over the years were examined with respect to the graphs of the raw-to-scale score conversions, summary statistics, and measurement properties calculated based on the strong true score theory. The effects of adjustments in rounding and truncating and the gaps resulting from the conversions were explored. The findings provided sufficient evidence that employing the arcsine transformation stabilized the error variability along almost the entire scale. But the linear transformation produced the most satisfactory results regarding the gap sizes, and the normalizing approach produced similar distributional properties among the tests. This research has revealed useful information about the features of scales based on different transformation approaches. (Contains 2 tables and 4 figures.)
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Publication Type: Journal Articles; Reports - Evaluative
Education Level: Junior High Schools
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: Taiwan