The COVID-19 outbreak was a major event that greatly impacted the economy and health systems around world. Understanding behavior of virus being able to perform long-term short-term future predictions daily new cases is working field for machine learning methods mathematical models. This paper compares Verhulst’s, Gompertz´s, SIR models from point view their efficiency describe in Spain. These ...

3 simulation models were applied to clinical judgments of "psychotic" vs. "neurotic" for 29 judges across 7 samples of MMPI profiles. A crossvalidated multiple correlation was used as a goodness-of-fit measure for the 3 judgment models. On this basis, each of the 29 clinical judges was characterized as being either "linear" or "configural" in his utilization of MMPI test data, where configurali...

This paper identifies the problem of analyses of message content as one of making specific inferences from recorded text to characteristics of a source that are not directly observable. The problem is common to a variety of analytical situations in the humanities and in the social sciences; and the way adequate solutions are found therefore deserves systematic attention. Choices among investiga...

A three-factor interest rate model defined on a finite domain has been provided. All the functions in the model can be obtained from the real markets. It has been proven that a final-value problem of the corresponding partial differential equation on a finite domain has a unique solution. Because the formulation of the problem is on a finite domain and correct, it is not difficult to design eff...

The advantages of digital media such as the Internet and CD-ROMs lie in the fact that their contents are easy to duplicate, edit, and distribute. These advantages, however, are double-edged swords, because they also facilitate unauthorized use of such contents. Data embedding, which places information into the contents themselves, is an approach to address this issue. Embedded information can b...

Nonlinear Leslie matrix models have a long history of use for modeling the dynamics of semelparous species. Semelparous models, as do nonlinear matrix models in general, undergo a transcritical equilibrium bifurcation at inherent net reproductive number R(0) = 1 where the extinction equilibrium loses stability. Semelparous models however do not fall under the purview of the general theory becau...

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