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Comparing the regression slopes of independent groups
Author(s) -
Ng Marie,
Wilcox Rand R.
Publication year - 2010
Publication title -
british journal of mathematical and statistical psychology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.157
H-Index - 51
eISSN - 2044-8317
pISSN - 0007-1102
DOI - 10.1348/000711009x456845
Subject(s) - heteroscedasticity , extant taxon , econometrics , statistics , regression analysis , mathematics , normality , homoscedasticity , regression , linear regression , evolutionary biology , biology
In this study, we explore the effects of non‐normality and heteroscedasticity when testing the hypothesis that regression lines associated with two independent groups have the same slopes. Our results indicate that some recently proposed methods that allow heteroscedasticity and perform well in extant simulation studies do not perform well for the situation at hand. Two of the methods studied here are recommended for general use.