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ERIC Number: EJ1111475
Record Type: Journal
Publication Date: 2006-Jun
Pages: 28
Abstractor: As Provided
ISBN: N/A
ISSN: EISSN-2330-8516
EISSN: N/A
Jackknife Estimation of Sampling Variance of Ratio Estimators in Complex Samples: Bias and the Coefficient of Variation. Research Report. ETS RR-06-19
Oranje, Andreas
ETS Research Report Series, Jun 2006
A multitude of methods has been proposed to estimate the sampling variance of ratio estimates in complex samples (Wolter, 1985). Hansen and Tepping (1985) studied some of those variance estimators and found that a high coefficient of variation (CV) of the denominator of a ratio estimate is indicative of a biased estimate of the standard error of a ratio estimate. Using the same populations, Kovar (1985) and Kovar, Rao, and Wu (1988) repeated the research and showed that the relation between a high CV and bias in standard errors is weak. In light of these conflicting findings, this study uses substantially different populations and design choices taken from the National Assessment of Educational Progress (NAEP) to further investigate the relationship between bias, the CV, and the number of strata, which has also been found to be an indicator of bias (Burke & Rust, 1995). It is found that the CV is a relatively weak indicator of bias, showing poor power properties. Suggestions are made to improve upon statistical suppression rules related to the CV and number of replicate strata.
Educational Testing Service. Rosedale Road, MS19-R Princeton, NJ 08541. Tel: 609-921-9000; Fax: 609-734-5410; e-mail: RDweb@ets.org; Web site: https://www.ets.org/research/policy_research_reports/ets
Publication Type: Journal Articles; Reports - Research
Education Level: Grade 4; Intermediate Grades; Elementary Education; Grade 8; Junior High Schools; Middle Schools; Secondary Education
Audience: N/A
Language: English
Sponsor: National Center for Education Statistics (ED)
Authoring Institution: N/A
Identifiers - Assessments and Surveys: National Assessment of Educational Progress
IES Funded: Yes
Grant or Contract Numbers: ED02CO0023