http://hdl.handle.net/1808/90 Search the Channel search http://kuscholarworks.ku.edu/dspace/simple-search http://hdl.handle.net/1808/5500 Title: The influence of neighborhood density (and neighborhood frequency) in Spanish speech production: A follow-up report<br/><br/>Authors: Vitevitch, Michael S.; Stamer, Melissa K.<br/><br/>Abstract: Vitevitch & Stamer (2006) observed that Spanish speakers in a picture-naming task named words with dense neighborhoods more slowly than words with sparse neighborhoods; a finding that contrasts with results typically obtained in studies of speech production in English (Vitevitch, 2002b). Baus, Costa & Carreiras (2008) raised concerns about the stimuli employed in Vitevitch & Stamer (2006), and found with a different set of pictures that Spanish speakers in a picture-naming task named words with dense neighborhoods more quickly than words with sparse neighborhoods. Several supplemental analyses of the stimuli employed in Vitevitch & Stamer (2006) are reported. Furthermore, the results of a picture-naming experiment raise concerns about the stimuli used by Baus, Costa & Carreiras (2008). Finally, an analysis of naming times from an independent set of pictures (Bates et al., 2003) replicated the pattern of results initially observed in Vitevitch & Stamer (2006): phonologically similar words compete during speech production in Spanish. Mon, 12 Oct 2009 17:26:28 GMT http://hdl.handle.net/1808/4405 Title: Proportional structural effects of formative indicators<br/><br/>Authors: Franke, George R.; Preacher, Kristopher J.; Rigdon, Ed E.<br/><br/>Abstract: Formative constructs must influence two or more distinct outcome variables for meaningful tests of the formative conceptualization. Because the construct mediates the effects of its indicators, the indicators must have effects on the outcomes that are proportional to their effects on theformative construct itself. This constraint has important implications for developing and testing formative models. This study demonstrates the existence of the constraint, shows that researchers must consider proportionality as a criterion for evaluating the formative conceptualization,provides examples of indicators having different effects and interpretations depending on the outcome variables used, discusses the selection of outcomes to provide rigorous rather than trivial tests of the formative conceptualization, and contends that the formative nature of constructscannot be justified in isolation from the consideration of outcome variables. In addition, the study demonstrates the importance of considering how the scaling of the formative construct influences the significance of the effects in the model. Sun, 15 Mar 2009 14:07:46 GMT http://hdl.handle.net/1808/1658 Title: Addressing moderated mediation hypotheses: Theory, methods, and prescriptions<br/><br/>Authors: Preacher, Kristopher J.; Rucker, Derek D.; Hayes, Andrew F.<br/><br/>Abstract: This article provides researchers with a guide to properly construe and conduct analyses of conditional indirect effects, commonly known as moderated mediation effects. We disentangle conflicting definitions of moderated mediation and describe approaches for estimating and testing a variety of hypotheses involving conditional indirect effects. We introduce standard errors for hypothesis testing and construction of confidence intervals in large samples but advocate that researchers use bootstrapping whenever possible. We also describe methods for probing significant conditional indirect effects by employing direct extensions of the simple slopes method and Johnson-Neyman technique for probing significant interactions. Finally, we provide an SPSS macro to facilitate the implementation of the recommended asymptotic and bootstrapping methods. We illustrate the application of these methods with an example drawn from the Michigan Study of Adolescent Life Transitions, showing that the indirect effect of intrinsic student interest on mathematics performance through teacher perceptions of talent is moderated by student math self-concept. Mon, 01 Jan 2007 00:00:00 GMT http://hdl.handle.net/1808/1506 Title: Alternatives to traditional model comparison strategies for covariance structure models<br/><br/>Authors: Preacher, K. J.; Cai, L.; MacCallum, R. C. Mon, 01 Jan 2007 00:00:00 GMT