Code, Apps, and Tutorials
Code, Apps, and Tutorials
Carl F. Falk
Associate Professor of Quantitative Psychology
Publications
Parsimony in Model Selection: Tools for Assessing Fit Propensity
Theories can be represented as statistical models for empirical testing. There is a vast literature on model selection and multimodel …
A Comparison of Modern and Popular Approaches to Calculating Reliability for Dichotomously Scored Items
Recent work on reliability coefficients has largely focused on continuous items, including critiques of Cronbach’s alpha. Although two …
A note on the interpretation and simulation of reparameterized intercepts in constrained versions of the nominal response model
This is a brief expository paper on reparameterized intercepts under constrained variants of the nominal response model, including the …
Estimation of response styles using the multidimensional nominal response model: A tutorial and comparison with sum scores
Recent years have seen a dramatic increase in item response models for measuring response styles on Likert-type items. These …
Model Specification Searches in Structural Equation Modeling with R
This article introduces and demonstrates the application of an R statistical programming environment code for conducting structural …
Computer Programming in Quantitative Analysis
Computer programming in quantitative analysis refers to the process of creating computer “code”—or instructions that a computer can …
Two Cross-Platform Programs for Inferences and Interval Estimation About Indirect Effects in Mediational Models
In this article, we describe two new programs that compute both p-values and confidence intervals (CI) for the indirect effect in …
The Relationship Between Unstandardized and Standardized Alpha, True Reliability, and the Underlying Measurement Model
Popular computer programs print 2 versions of Cronbach’s alpha: unstandardized alpha, αΣ, based on the covariance matrix, and …