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A comparison of ordinary least squar...

Rosopa, Patrick J.

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A comparison of ordinary least squares, weighted least squares, and other procedures when testing for the equality of regression slopes with heteroscedasticity across groups: A Monte Carlo study.

Record Type:	Electronic resources : Monograph/item
Title/Author:	A comparison of ordinary least squares, weighted least squares, and other procedures when testing for the equality of regression slopes with heteroscedasticity across groups: A Monte Carlo study./
Author:	Rosopa, Patrick J.
Description:	206 p.
Notes:	Source: Dissertation Abstracts International, Volume: 67-11, Section: B, page: 6764.
Contained By:	Dissertation Abstracts International67-11B.
Subject:	Psychology, Industrial. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3243489
ISBN:	9780542993725

A comparison of ordinary least squares, weighted least squares, and other procedures when testing for the equality of regression slopes with heteroscedasticity across groups: A Monte Carlo study.
Rosopa, Patrick J.

A comparison of ordinary least squares, weighted least squares, and other procedures when testing for the equality of regression slopes with heteroscedasticity across groups: A Monte Carlo study. - 206 p.

Source: Dissertation Abstracts International, Volume: 67-11, Section: B, page: 6764.

Thesis (Ph.D.)--University of Central Florida, 2006.

When testing for the equality of regression slopes based on ordinary least squares (OLS) estimation, extant research has shown that the standard F performs poorly when the critical assumption of homoscedasticity is violated, resulting in increased Type I error rates and reduced statistical power (Box, 1954; DeShon & Alexander, 1996; Wilcox, 1997). Overton (2001) recommended weighted least squares estimation, demonstrating that it outperformed OLS and performed comparably to various statistical approximations. However, Overton's method was limited to two groups. In this study, a generalization of Overton's method is described. Then, using a Monte Carlo simulation, its performance was compared to three alternative weight estimators and three other methods. The results suggest that the generalization provides power levels comparable to the other methods without sacrificing control of Type I error rates. Moreover, in contrast to the statistical approximations, the generalization (a) is computationally simple, (b) can be conducted in commonly available statistical software, and (c) permits post hoc analyses. Various unique findings are discussed. In addition, implications for theory and practice in psychology and future research directions are discussed.

ISBN: 9780542993725Subjects--Topical Terms:

520063
Psychology, Industrial.

A comparison of ordinary least squares, weighted least squares, and other procedures when testing for the equality of regression slopes with heteroscedasticity across groups: A Monte Carlo study.
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035 $a (UMI)AAI3243489
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040 $a UMI $c UMI
100 1 $a Rosopa, Patrick J. $3 1923099
245 1 2 $a A comparison of ordinary least squares, weighted least squares, and other procedures when testing for the equality of regression slopes with heteroscedasticity across groups: A Monte Carlo study.
300 $a 206 p.
500 $a Source: Dissertation Abstracts International, Volume: 67-11, Section: B, page: 6764.
500 $a Adviser: Eugene F. Stone-Romero.
502 $a Thesis (Ph.D.)--University of Central Florida, 2006.
520 $a When testing for the equality of regression slopes based on ordinary least squares (OLS) estimation, extant research has shown that the standard F performs poorly when the critical assumption of homoscedasticity is violated, resulting in increased Type I error rates and reduced statistical power (Box, 1954; DeShon & Alexander, 1996; Wilcox, 1997). Overton (2001) recommended weighted least squares estimation, demonstrating that it outperformed OLS and performed comparably to various statistical approximations. However, Overton's method was limited to two groups. In this study, a generalization of Overton's method is described. Then, using a Monte Carlo simulation, its performance was compared to three alternative weight estimators and three other methods. The results suggest that the generalization provides power levels comparable to the other methods without sacrificing control of Type I error rates. Moreover, in contrast to the statistical approximations, the generalization (a) is computationally simple, (b) can be conducted in commonly available statistical software, and (c) permits post hoc analyses. Various unique findings are discussed. In addition, implications for theory and practice in psychology and future research directions are discussed.
590 $a School code: 0705.
650 4 $a Psychology, Industrial. $3 520063
650 4 $a Psychology, Psychometrics. $3 1017742
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710 2 0 $a University of Central Florida. $3 1018467
773 0 $t Dissertation Abstracts International $g 67-11B.
790 1 0 $a Stone-Romero, Eugene F., $e advisor
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791 $a Ph.D.
792 $a 2006
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3243489