Robust Modifications of the Levene and O’Brien Tests for Spread
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May 1, 2012
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Abdul R. Othman
Universiti Sains, Malaysia
The Sin Yan
Universiti Sains Malaysia, Georgetown, Penang, Malaysia
H. J. Keselman
University of Manitoba, Winnipeg, Manitoba, Canada
Rand R. Wilcox
University of Southern California, Los Angeles
James Algina
University of Florida
Abstract
Variants of Levene’s and O’Brien’s procedures not investigated by Keselman, Wilcox & Algina (2008) were examined. Simulations indicate that a new O’Brien variant provides very good Type I error control and is simpler for applied researchers to compute than the method recommended by Keselman, et al.
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