The insurance internal market has existed since 1993 (enforced by the third life directive). Its’ main features are a common framework to allow insurers to operate throughout the EU and to establish and provide services ...

The paper deals with the tests for paired variables called also tests for pairs of variables. The observations are made of pairs of measurements. They can be correlated. It causes the necessity of applying another ...

In the paper we compare the properties of theoretical income distributions from the point of view of their application to the analysis of wage distributions in Poland. Among them the lognormal and Dagum distributions ...

The skew-normal is a class of distribution that includes the normal distribution as a special case. A systematic treatment of the skew-normal distribution has been given in Azzalini (1985, 1986); generalizations to the ...

The paper characterizes and gives some basic properties of matrix H that is the operator of orthogonal projection on the space of columns of matrix X, which is the hat matrix in linear regression model. The author ...

Tree-based models are popular a widely used because they are simple, flexible and powerful tools for classification. Unfortunately they are not stable classifiers. Significant improvement of the model stability and ...

In robust Bayesian analysis a prior is assumed to belong to a family instead of being specified exactly. The multiplicity of priors leads to a collection of Bayes actions. It is clearly essential to be able to recommend ...

The paper is studying the estimation problem of individual weights of objects using the chemical balance weighing design under the restriction on the number times in which each object is weighed. We assume that errors ...

The quadratic form of the sample mean and sample variance was considered. The sample is from normal distribution. The density function of the quadratic form has been derived. The quadratic form can be applied as the test ...