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ERIC Number: EJ741008
Record Type: Journal
Publication Date: 2006
Pages: 8
Abstractor: Author
ISBN: N/A
ISSN: ISSN-0146-6216
Robust Confidence Interval for a Ratio of Standard Deviations
Bonett, Douglas G.
Applied Psychological Measurement, v30 n5 p432-439 2006
Comparing variability of test scores across alternate forms, test conditions, or subpopulations is a fundamental problem in psychometrics. A confidence interval for a ratio of standard deviations is proposed that performs as well as the classic method with normal distributions and performs dramatically better with nonnormal distributions. A simple and accurate sample size planning formula is proposed for estimating a ratio of standard deviations with desired confidence and precision. (Contains 5 tables.)
SAGE Publications. 2455 Teller Road, Thousand Oaks, CA 91320. Tel: 800-818-7243; Tel: 805-499-9774; Fax: 800-583-2665; e-mail: journals@sagepub.com; Web site: http://sagepub.com.
Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A