The present study examined the extent of measurement invariance of the Behavioral Regulation in Exercise Questionnaire – 2 (BREQ-2) scores across Greek men and women exercise participants. Data were analyzed from 330 men and 403 women exercise participants aged between 18 and 64 years. After obtaining a sound factor structure via confirmatory factor analysis and strong internal consistency of t...

The explosion of social networking websites in general, and Facebook in particular, impacts the educational context both positively and negatively. Too much time spent on Facebook leads to negative effects on the university work of students. The objectives of this research are to measure and analyse the relationship between the Facebook dependence and the negative consequences of the excessive ...

First, Padoa’s principle is used to prove the non-definability of the fundamental qualitative concepts of comparative probability, independence and comparative uncertainty in terms of each other. Second, the qualitative axioms of uncertainty leading to an entropy representation are new. Third, a qualitative random-variable axiomatization of these concepts is given, but the random variables are ...

This study’s purpose was to examine the psychometric properties of two new scales developed to quantitatively measure participants’ ownership in exercise classes and empowerment with respect to exercise. These two outcome measures will compliment Achievement Goal Perspective Theory (AGPT) grounded research to better understand participants’ exercise experiences. College exercise class participa...

We introduce a machine free mathematical framework to get a natural formalization of some general notions of infinite computation in the context of Kolmogorov complexity. Namely, the classes MaxX→D PR and MaxX→D Rec of functions X→ D which are pointwise maximum of partial or total computable sequences of functions where D = (D,<) is some computable partially ordered set. The enumeration theorem...

The constant-complement approach is one of the principal strategies for defining the reflections of database view updates. The purpose of this paper is twofold. First, a self-contained presentation of the strategy itself is given. Second, two fundamental invariance problems are examined. In admissibility invariance, the question of when the translatability of a view update is independent of the...

In healthy humans and other animals, behavioral activity exhibits scale invariance over multiple timescales from minutes to 24 h, whereas in aging or diseased conditions, scale invariance is usually reduced significantly. Accordingly, scale invariance can be a potential marker for health. Given compelling indications that exercise is beneficial for mental and physical health, we tested to what ...

The effectiveness of confirmatory factor analytic (CFA) and item response theory (IRT) methods of assessing measurement invariance were investigated using simulated data with a known lack of invariance. Across all study conditions, IRT likelihood ratio (LR) tests consistently outperformed both CFA and IRT differential functioning of items and tests (DFIT) analyses in terms of detecting a lack o...

This paper concerns measurement invariance analysis for situations with many groups or time points. A BSEM (Bayesian Structural Equation Modeling) approach is proposed for detecting non-invariance that is similar to modification indices with maximum-likelihood estimation, but unlike maximum-likelihood is applicable also for high-dimensional latent variable models for categorical variables. Unde...

An extension of the uniform invariance principle for ordinary differential equations with finite delay is developed. The uniform invariance principle allows the derivative of the auxiliary scalar function V to be positive in some bounded sets of the state space while the classical invariance principle assumes that V̇ ≤ 0. As a consequence, the uniform invariance principle can deal with a larger ...