Grzegorz Koszela

Warsaw University of Life Sciences - SGGW | SGGW · Department of Econometrics and Statistics

The main purpose of the paper is to evaluate the online teaching process at universities, and detect shortages and gaps in online learning in the aftermath of the COVID-19 pandemic outbreak. The research results are the initial steps leading to the development of a guide and online open access tools supporting academic teachers in the efficient use...

The main aim of this paper was to determine changes in renewable energy production in the countries of Central and Eastern Europe. The specific objectives were to assess the degree of concentration of renewable energy and the pace of changes in the volume of production of this energy from individual sources in the countries of Central and Eastern E...

The introduction of electromobility contributes to an increase in energy efficiency and lower air pollution. European countries have not been among the world’s leading countries in this statistic. In addition, there have been different paces in the implementation of electromobility in individual countries. The main purpose of this paper is to deter...

The main purpose of this paper is to assess energy consumption with a breakdown into main sectors of the countries that belong to the Visegrad Group. The specific objectives aim to determine changes in energy absorption, its productivity, structure by sectors and to show the similarities of the Visegrad Group countries to the other EU states in ter...

The main purpose of this paper is to present the differences in the volume of energy consumption in transport in the EU (European Union) countries. The specific objectives aim to determine the directions of changes and the degree of concentration in the volume of energy utilized by the transport sector in EU states, showing various models in this a...

The main objective of the paper was to show the relationship of greenhouse gas emissions by agriculture with economic development and agricultural production parameters in the European Union. All EU Member States were selected for research purposefully. The research period concerned the years 2004-2017. The sources of materials were EUROSTAT data,...

The main purpose of the work is to show the level of air pollution emitted by road transport and its relationship with economic development and transport infrastructure in European Union countries. The study presents the diversity in emissions of road transport by countries, shows the dynamics of changes in this area, determines the relationships b...

The agricultural market is an integral component of the entire market, and its aim is the production of food and essential raw materials. The subject of research was the analysis of the agricultural market in Poland. For this purpose, several rankings for each year were developed using selected methods of linear ordering. To choose the best one ran...

The main purpose of the paper was to show the level of air pollution and its relation to economic development in the European Union countries. All European Union member states were selected for research purposefully. The research period concerned the years 2005-2016. Data was obtained from EUROSTAT and from the literature on the subject. For the an...

The main objective of the paper was to show the level of public spending on environmental protection in the European Union countries. All European Union mem-ber states were selected for research purposefully. The research period concerned the years 2005-2017. The sources of materials were EUROSTAT data, literature of the subject. For the analysis a...

The research of food preferences has, besides a sociological aspect, an economic aspect and is a good starting point for estimating the willingness to incur expenditures on the consumption of individual products. In the paper, the authors compared food preferences on the Asian market for 9 product groups. Due to the complexity of the problem, the s...

Badanie preferencji żywnościowych ma poza aspektem socjologicznym, także aspekt ekonomiczny, np. ze strony producentów i szukania przez nich rynków zbytu dla produkowanej żywności. Jest także punktem wyjścia do szacowania skłonności konsumentów do ponoszenia wydatków na poszczególne produkty żywnościowe. W pracy podjęto próbę porównania tych prefer...

This paper attempts to rank EU countries according to changes in food consumer preferences in EU countries between 2001 and 2013. The size of these changes was determined using the synthetic rate created for this purpose. This rate was intended to accommodate changes in consumption levels in 9 groups of product per capita. It turns out that we may...

Food waste is the world-wide social and economic problem, and also large and unnecessary burden for the environment. In this paper was taken the problem of comparing changes in the level of food wastage in the EU countries in 2000–2011. There were used two techniques: multidimensional comparative analysis (MCA) and grade data analysis (GDA). The se...

The article deals with the problem of measuring the dissimilarity structures. It turned out that the proposed measure, built by analogy with the Gini coefficient, can capture the subtleties, to which are not sensitive measure based on the metrics, commonly used in the literature. This paper presents a way to visualize structures using maps over-rep...

Food production and consumption have significant impacts on the environment. Changes in consumption patterns typically entail changes in related production systems. Consumers through their consumption behavior, market demand for food, and choices between animal and vegetal products indirectly influence the environment. The paper is aimed at assessi...

Praca jest bezpośrednia kontynuacją serii prac autorów, dotyczących konstrukcji nowych wskaźników koncentracji. W niniejszej pracy rozważono mierniki zróżnicowania struktur. W pracy na przykładzie struktur gospodarstw rolnych krajów Unii Europejskiej w roku 2003 i roku 2010, względem grup obszarowych, dokonano oceny zmian tych struktur, ze względu...

The aim of the paper is to answer the question whether convergence between households expenditures structures in the European Union exists. In order to study the phenomenon concepts of β-and σ-convergences are applied. The research is based on data on households expenditures in the period from 1995 through 2011 provided by EUROSTAT. It covers 27 co...

The article discusses the problem of similarities and differences of countries with respect to the structure of household expenditure in the European Union. This issue is important due to problem of economic and social and cohesion among Member States. Comparative analysis of structures of consumption expenditures of households in EU member countri...

The purpose of this article was to examine whether differences in the structure of consumption expenditures of Polish households are caused by different levels of citizens' wealth. The analysis showed that the shape of these structures are highly influenced by the values of equivalent households' income. Incomes received by the poorest households a...

Specialist bibliography offers an equation of the CML, but no formulae for market portfolio' s risk and return. It is connected with the omission of the equation of hyperbola, illustrating the interdependence between risk and return of a two-element portfolio. Co-ordinates of point C are the key for the selection of a portfolio with a predetermined...