The research articles in this volume cover timely quantitative psychology topics, including new methods in item response theory, computerized adaptive testing, cognitive diagnostic modeling, and psychological scaling. Topics within general quantitative methodology include structural equation modeling, factor analysis, causal modeling, mediation, missing data methods, and longitudinal data analysis. These methods will appeal, in particular, to researchers in the social sciences. The 80th annual meeting took place in Beijing, China, between the 12th and 16th of July, 2015. Previous volumes to showcase work from the Psychometric Society’s Meeting are New Developments in Quantitative Psychology: Presentations from the 77th Annual Psychometric Society Meeting (Springer, 2013), Quantitative Psychology Research: The 78th Annual Meeting of the Psychometric Society (Springer, 2015), and Quantitative Psychology Research: The 79th Annual Meeting of the Psychometric Society, Wisconsin, USA, 2014 (Springer, 2015).
Even if I had stuck to my original plan of doing nothing with this website except provide an archive for my own work, a section for Essays, like a section for Poetry, would have been at the centre of the enterprise, as an equal half of a twin heart. But I was not long embarked on building the Essays section when I saw the necessity of providing small anthologies of articles by Guest Writers, and then later I got the idea of pointing to individual essays (Prose Finds) that might serve as a gangway into the viewpoint, or field of expertise, represented by that particular author. Eventually there might be a further classification in which I can enshrine, with a short introductory essay, yet further essays by writers in the past. Essays about essays, all the way back to Montaigne. His face is on this page because he was the founding father of the essay as we know it today. Nowadays most essays are first composed as journalism of one kind or another, but we should never forget that the man who had the idea kept his work for himself until he thought it good enough for a book. The affinity of the essay with the poem was thus made clear at the outset.