Thunderstorm phobias

This study, consists of a retrospective analysis made from the case notes of 10 thunderstorm phobics who were treated between 1963 and 1977.A wide range of data was abstracted from the histories in order to formulate some generalizations concerning the aetiology of this type of phobia. All the patients studied were female, generally they had experienced the problem in childhood usually in a severe form and its further exacerbation was often attributed to aversive life events. While many reported related sensitivities such as overreaction to sudden and loud noises, other psychiatric problems were rarely presented for treatment.     

On Monadic Operators on Modal Pseudocomplemented De Morgan Algebras and Tetravalent Modal Algebras

Studia Logica - In our paper, monadic modal pseudocomplemented De Morgan algebras (or mmpM) are considered following Halmos’ studies on monadic Boolean algebras. Hence, their topological...     

Semi-sparse PCA

It is well known that the classical exploratory factor analysis (EFA) of data with more observations than variables has several types of indeterminacy. We study the factor indeterminacy and show some new aspects of this problem by considering EFA as a specific data matrix decomposition. We adopt a new approach to the EFA estimation and achieve a new characterization of the factor indeterminacy problem. A new alternative model is proposed, which gives determinate factors and can be seen as a semi-sparse principal component analysis (PCA). An alternating algorithm is developed, where in each step a Procrustes problem is solved. It is demonstrated that the new model/algorithm can act as a specific sparse PCA and as a low-rank-plus-sparse matrix decomposition. Numerical examples with several large data sets illustrate the versatility of the new model, and the performance and behaviour of its algorithmic implementation.

     

Meaning,Understanding, and A Priori Knowledge

Philosophia - According to the most popular account of the a priori, which we might call Analytic Account of the A Priori, we can explain the a priori in terms of the notion of analyticity....