Peter C. M. Molenaar

TL;DR: In this article, it is shown that the direct consequences of the classical ergodic theorems for psychology and psychometrics invalidate this conjectured generalizability: only under very strict conditions-which are hardly obtained in real psychological processes-can a generalization be made from a structure of interindividual variation to the analogous structure of intraindividual variation.

TL;DR: In this paper, the authors present two illustrations involving analysis of intraindividual variation of personality and emotional processes in order to obtain valid results, and show that such analyses do not provide information for, and cannot be applied at, the level of the individual, except on rare occasions when the processes of interest meet certain stringent conditions.

TL;DR: Traditional methodological approaches to stagewise cognitive developmental research are evaluated and integrated on the basis of catastrophe theory, which specifies a set of common criteria for testing the discontinuity hypothesis proposed by Piaget.

TL;DR: A new statistical technique, coined dynamic factor analysis, is proposed, which accounts for the entire lagged covariance function of an arbitrary second order stationary time series.

TL;DR: It is concluded that at least some patients with acquired neuromyotonia have antibodies directed against aminopyridine‐ or α‐dendrotoxin‐sensitive K+ channels in motor and sensory neurons, and they are likely to be implicated in the disease process.