Titlebook: Quantitative Psychology; The 82nd Annual Meet Marie Wiberg,Steven Culpepper,Dylan Molenaar Conference proceedings 2018 Springer Internation

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Disentangling Treatment and Placebo Effects in Randomized Experiments Using Principal Stratificatioow to disentangle the medical effect of the drug from the placebo effect of being treated using data arising in a placebo-controlled RCT. Our proposal uses principal stratification as the key statistical tool. The method is applied to initial data from an actual experiment to illustrate important id

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Investigating the Constrained-Weighted Item Selection Methods for CD-CAT,t been investigated in CD-CAT yet. Therefore, the aim of this study is two fold (a) to integrate the indices with the constraint management procedure for item selection, and (b) to investigate the efficiency of these item selection methods in CA-CAT. It was found that the constraint-weighted indices

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Incorporating Information Functions in IRT Scaling,hodologies as well as the two new scaling methodologies were applied to simulated administrations of a fixed form under different latent trait distributions. Results suggest that IRT scaling by combining TCCs with TIFs yields some benefits over the existing characteristic curve methodologies; howeve

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