caa a22 4500 606241825 CHVBK 20210128101315.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s11336-013-9375-8 doi (NATIONALLICENCE)springer-10.1007/s11336-013-9375-8 Evaluating Predictors of Dispersion: A Comparison of Dominance Analysis and Bayesian Model Averaging [Elektronische Daten] [Yiyun Shou, Michael Smithson] Conventional measures of predictor importance in linear models are applicable only when the assumption of homoscedasticity is satisfied. Moreover, they cannot be adapted to evaluating predictor importance in models of heteroscedasticity (i.e., dispersion), an issue that seems not to have been systematically addressed in the literature. We compare two suitable approaches, Dominance Analysis (DA) and Bayesian Model Averaging (BMA), for simultaneously evaluating predictor importance in models of location and dispersion. We apply them to the beta general linear model as a test-case, illustrating this with an example using real data. Simulations using several different model structures, sample sizes, and degrees of multicollinearity suggest that both DA and BMA largely agree on the relative importance of predictors of the mean, but differ when ranking predictors of dispersion. The main implication of these findings for researchers is that the choice between DA and BMA is most important when they wish to evaluate the importance of predictors of dispersion. The Psychometric Society, 2013 heteroscedasticity nationallicence predictor importance nationallicence dominance analysis nationallicence Bayesian model averaging nationallicence beta regression nationallicence beta GLM nationallicence Shou Yiyun Research School of Psychology, The Australian National University, 0200, Canberra, ACT, Australia aut Smithson Michael Research School of Psychology, The Australian National University, 0200, Canberra, ACT, Australia aut Psychometrika Springer US; http://www.springer-ny.com 80/1(2015-03-01), 236-256 0033-3123 80:1<236 2015 80 11336 https://doi.org/10.1007/s11336-013-9375-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11336-013-9375-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shou Yiyun Research School of Psychology, The Australian National University, 0200, Canberra, ACT, Australia aut NATIONALLICENCE 700 1- Smithson Michael Research School of Psychology, The Australian National University, 0200, Canberra, ACT, Australia aut NATIONALLICENCE 773 0- Psychometrika Springer US; http://www.springer-ny.com 80/1(2015-03-01), 236-256 0033-3123 80:1<236 2015 80 11336