Religious institutions such as the Catholic Church are gaining in importance again in the wake of the economic crisis in Spain. They act as a reference point and meeting place which keep the faith community together. Tangible assistance is offered and transnational communication structures and...

This paper considers a restriction to non-negative matrix factorization in which at least one matrix factor is stochastic. That is, the elements of the matrix factors are non-negative and the columns of one matrix factor sum to 1. This restriction includes topic models, a popular method for...

Practitioners often have to compute a correlation matrix for financial applications as in value-at-risk, asset allocation, and option pricing, etc. The computed correlation matrix, however, could be a non-positive semidefinite matrix due to various reasons. This article provides two simple...

This is the third paper in a series devoted to obtaining noise-reduced, stable correlations by smoothing time series using Singular Spectrum Analysis, or SSA. Here we show that the SSA-based correlations are superior in terms of noise reduction, employing a number of simple tests using Random...

Among many radionuclides released to the environment during a radiological emergency 131I, 134Cs and 137Cs are usually the most abundant ones. They are transferred to air, water and soil and from those media readily relocated to plants, including those intended for human consumption and for...

This article proposes a new economic modeling theoretical framework known as multidimensional real-time economic modeling (MRTE-Modeling). The model is an important tool that economists and educators can use to demonstrate the multidimensional aspects of economic behavior. MRTE-Modeling...

Slepian and Sudakov-Fernique type inequalities, which compare expectations of maxima of Gaussian random vectors under certain restrictions on the covariance matrices, play an important role in probability theory, especially in empirical process and extreme value theories. Here we give explicit...

Religious institutions such as the Catholic Church are gaining in importance again in the wake of the economic crisis in Spain. They act as a reference point and meeting place which keep the faith community together. Tangible assistance is offered and transnational communication structures and...

The Ramsey regression equation specification error test (RESET) furnishes a diagnostic for omitted variables in a linear regression model specification (i.e., the null hypothesis is no omitted variables). Integer powers of fitted values from a regression analysis are introduced as additional...