A relationship between the theoretical terms and the observational ones, called also a perceptual or observational, is essential for scientific research of empirical type, including social sciences and economic sciences. ...

In the paper the problem of sample allocation for both stages in such a way, that the accuracy of an estimation of the means of many variables is maximal and the survey cost is restricted is considered. As the measure ...

The aim of this paper is to present a method of constructing effective portfolios with application of Wolfs algorithm. The effective portfolios are understood as those which have the lowest risk at give rate of return, ...

This paper presents a model of dynamic, discrete decision-making problem (finite number of periods, states and decision variables). Described process has returns in random variables spaces equipped with partial order. ...

This study used stochastic dominance tests for ranking alternatives under ambiguity, to build an efficient set of assets for a different class of investors. We propose a two-step procedure: first test for multivalued ...

The comparing distributions of two discrete random variables appears often in statistical research. In many cases we can apply the test for two means for it. If the means are equal and we do not know the set of values ...

Tests based on ienght o f runs are used both in statistical inference and statistical quality assurance. The paper presents power of three tests based on: - maximum run lenght on one side o f the medium, - smaller from ...

he problem of prediction of the total value in a domain based on simple regression superpopulation model (with one auxiliary variable and no intercept) is considered. The problem of robust estimation against outliers of ...