Over the past several decades, most industrialized countries have experienced a rise in commuting distances, spurring scholarly interest in its determinants. The primary theoretical explanation for longer commuting distances is based on higher wages; however, empirical evidence is minimal. We...

In this work we propose a novel EM method for the estimation of nonlinear nonparametric mixed-effects models, aimed at unsupervised classification. We perform simulation studies in order to evaluate the algorithm performance and we apply this new procedure to a real dataset. Copyright...

Formulas for estimating sample sizes are presented to provide specified levels of power for tests of significance from a longitudinal design allowing for subject attrition. These formulas are derived for a comparison of two groups in terms of single degree-of-freedom contrasts of population...

In this paper, we generalize the single-index models to the scenarios with random effects. The introduction of the random effects raises interesting inferential challenges. Instead of treating the variance matrix as the tuning parameters in the nonparametric model of Gu and Ma (2005), we propose...

Innerhalb der letzten Jahrzehnte hat ein Großteil der industrialisierten Länder einen Anstieg der Pendeldistanzen verzeichnet. Dies ruft zunehmendes Interesse an den Determinanten der Pendelstrecken hervor. Die primäre theoretische Erklärung für längere Pendeldistanzen basiert auf höheren...