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Przestrzenne zróżnicowanie sytuacji pokolenia 50 plus na rynku pracy z wykorzystaniem zmiennej syntetycznej

100%
Giemza D.
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu
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2020
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issue vol. 64, nr 5
65-84
PL
Zasadniczym celem opracowania jest porównanie sytuacji pokolenia 50 plus na rynku pracy w województwach Polski, a także identyfikacja zależności przestrzennych, łącznie (ogółem) oraz w ramach różnych obszarów (kategorii) charakteryzujących sytuację pokolenia 50 plus na rynku pracy. Badanie prowadzono zarówno w wymiarze przestrzennym, jak i czasowym, z wykorzystaniem zmiennej syntetycznej, co umożliwiało uzyskanie oceny z punktu widzenia kilku cech diagnostycznych, bowiem rynek pracy jest kategorią złożoną i stosowanie pojedynczych miar względnych mogłoby prowadzić do jednostronnej analizy. Na podstawie uzyskanych wartości zmiennych syntetycznych, za pomocą globalnej i lokalnej statystyki Morana, przeprowadzono identyfikację występowania autokorelacji przestrzennych.
EN
The chief purpose of this study is to compare and contrast the situation of the 50+ generation on the labour market in the voivodships of Poland and to identify spatial dependencies, both generally and in individual areas characterising the situation of this group on the labour market. The study was conducted both in the spatial and temporal dimension using the synthetic variable which allowed to obtain the evaluation on the basis of several diagnostic features; this is so as the labour market is a complex category and using singular relative gauges could lead to the analysis becoming skewed. The obtained synthetic variables were used to identify the occurrence of spatial autocorrelations with the global and local Moran’s I statistics.
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Ranking of optimal stock portfolios determined on the basis of expected utility maximization criterion

100%
Giemza D.
Journal of Economics and Management
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2021
|
vol. 43
157-178
EN
Aim/purpose – The aim of the paper is to rank the optimal portfolios of shares of companies listed on the Warsaw Stock Exchange, taking into account the investor’s propensity to risk. Design/methodology/approach – Investment portfolios consisting of varied number of companies selected from WIG 20 index were built. Next, the weights of equity holdings of these companies in the entire portfolio were determined, maximizing portfolio’s expected (square) utility function, and then the obtained structures were compared between investors with various levels of risk propensity. Using Hellwig’s taxonomic development measure, a ranking of optimum stock portfolios depending on the investor’s risk propensity was prepared. The research analyzed quotations from 248 trading sessions. Findings – The findings indicated that whilst there are differences in the weight structures of equity holdings in the entire portfolio between the investor characterized by aversion to risk at the level of γ = 10 and the investor characterized by aversion to risk at the level of γ = 100, the rankings of the constructed optimum portfolios demonstrate strong similarity. The study validated, in conformity with the literature, that with the increase in the number of equity holdings in the portfolio, the portfolio risk initially decreases and then becomes stable at a certain level. Research implications/limitations – The study used data from the past as for which there is no guarantee that they will be adequate for the future. There is sensitivity to the selection of the period from which the historic data come. When changing the period of the analyzed historic data by a small time unit it may prove that the portfolio composition will become totally different. Originality/value/contribution – The paper compares the composition of optimum stock portfolios depending on the investor’s propensity to risk. Their ranking was created using the taxonomic method for this purpose. Taking advantage of this method also additional variables can be taken into account, which describe and differentiate the portfolio and they can be assigned relevant significance depending on the investor’s preferences.
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