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CLASSIFICATION OF POLISH HOUSEHOLDS BASED ON THEIR INCOMES BY MEANS OF DECISION TREES

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Karpio A., Koszela G., Orłowski A., Łukasiewicz P.
Metody Ilościowe w Badaniach Ekonomicznych
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2014
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vol. 15
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issue 2
403-413
EN
Classification trees included in SQL Server 2008R2 Analysis Services package have been used to classify Polish households based on their incomes. The analysis has been performed by means of the three algorithms and their effectiveness has been measured. Using the best algorithm a groups of households with the lowest and the largest incomes have been distinguished. The most important attributes describing households with the lowest and the largest incomes were identified and discussed.
2
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DOCHODY INDYWIDUALNE A DOCHODY GOSPODARSTW DOMOWYCH W POLSCE W LATACH 2000 – 2010

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Łukasiewicz P., Karpio K., Orłowski A.
Metody Ilościowe w Badaniach Ekonomicznych
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2013
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vol. 14
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issue 3
62-70
EN
In this paper we study dependencies between distributions of personal and households incomes in Poland in 2000 to 2010. For example, the distributions of households incomes in the USA can be obtained by a convolution of distributions of personal incomes of family members. As was derived from our previous studies for 2004, there is no such a simple dependency in Poland. In principle, there is a very little knowledge about a type of relationship between those incomes in Poland. In the case of the USA personal incomes of family members are probably independent of each other. On the other hand, those variables are for sure dependent for Poland. In this paper we study personal and households incomes in Poland, their changes in time and their mutual relationship. Incomes distributions have been described by the three-parameter Dagum function.
3
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Some applications of rank clocks method

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Karpio K., Orłowski A., Łukasiewicz P., Różański J.
Metody Ilościowe w Badaniach Ekonomicznych
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2011
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vol. 12
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issue 1
97-104
EN
A method first used to search for events leading to the changes of sizes of major US, UK, and world cities is applied to investigate the presence of events influencing incomes of commercial companies. Top 100 US companies from the period of 1955-2005 are analyzed. Distributions of incomes are found to be stable but the changes in rank positions of companies lead to discovery of some instabilities. Parameters describing changes in the rank positions are calculated, discussed, and compared to the results of previous studies.
4
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Changes of distributions of personal incomes in US from 1998 to 2011

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Łukasiewicz P., Karpio K., Orłowski A.
Metody Ilościowe w Badaniach Ekonomicznych
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2012
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vol. 13
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issue 2
96-106
EN
In this paper the results of studies of personal incomes changes are presented for years 1998 to 2011. The studies were based on the micro-data regarding families and households. Among others it was showed that concentration of individual incomes dropped during the period of 1998 to 2011. The opposite trends of changes of income inequalities for households and individuals were observed.
5
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Two-component structure of household income distributions in Poland

100%
Łukasiewicz P., Karpio K., Orłowski A.
Equilibrium. Quarterly Journal of Economics and Economic Policy
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2018
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vol. 13
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issue 4
603-622
EN
Research background: Studies of the structures of the income distributions have been performed for about 15 years. They indicate that there is no model which describes the distributions in their whole range. This effect is explained by the existence of different mechanisms yielding to low-medium and high incomes. While more than 97% of the distributions can be described by exponential or log-normal models, high incomes (about 3% or less) are in agreement with the power law. Purpose of the article: The aim of this paper is an analysis of the structure of the household income distributions in Poland. We verify the hypothesis about two-part structure of those distributions by using log-normal and Pareto models. Methods: The studies are based on the households? budgets microdata for years 2004?2012. The two-component models are used to describe the income distributions. The major parts of the distributions are described by the two parametric log-normal model. The highest incomes are described by the Pareto model. We also investigate the agreement with data of the more complex models, like Dagum, and Singh-Madalla. Findings & Value added: One has showed that two or three parametric models explain from about 95% to more than 99% of income distributions. The poorest agreement with data is for the log-normal model, while the best agreement has been obtained for the Dagum model. However, two-part model: log-normal for low-middle incomes and Pareto model for the highest incomes describes almost the whole range of income distributions very well.
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