Strategies for Testing Slope Differences. Research Report. ETS RR-09-32

Autor/inn/en	Moses, Tim; Klockars, Alan
Institution	Educational Testing Service
Titel	Strategies for Testing Slope Differences. Research Report. ETS RR-09-32
Quelle	(2009), (45 Seiten) PDF als Volltext kostenfreie Datei Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Monographie
Schlagwörter	Evaluation Methods; Maximum Likelihood Statistics; Regression (Statistics); Robustness (Statistics); Least Squares Statistics; Statistical Analysis; Differences; Comparative Analysis + Suchen Sie Ihr Suchwort? Regression; Regressionsanalyse; Widerstandsfähigkeit; Statistische Analyse; Unterscheiden
Abstract	The robustness and power of 9 strategies for testing the differences in groups' regression slopes were assessed under nonnormality and residual variance heterogeneity. For the conditions considered, the most robust strategies were the trimmed and Winsorized slope estimates used with the James second-order test, the Theil-Sen slope estimates used with James, and the Theil-Sen estimates used with percentile bootstrapping. The use of Theil-Sen slope estimates produced more powerful tests than the use of trimmed and Winsorized slopes. Appendices include: (1) The Minimum Maximum Likelihood Type (MM) Regression Algorithm; and (2) The Critical Value of the James Second-Order Test Statistics. (Contains 11 tables and 4 figures.) (As Provided).
Anmerkungen	Educational Testing Service. Rosedale Road Mailstop 19R, Princeton, NJ 08541-0001. Tel: 609-921-9000; Fax: 609-734-5410; Web site: http://www.ets.org
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10