Secondary education is an important public service in most countries, as well as a significant consumer of the state budget. In order to make secondary education as efficient as possible, researchers make efficiency analyzes. The purpose of the master's thesis was, with the help of models of the efficiency of secondary education, to identify opportunities for improvement and thus contribute facts to help plan improvements to increase efficiency. The aim of the master's thesis was to develop a model for assessing the efficiency of secondary education in selected EU countries and to identify which secondary education systems within the European Union are more efficient and which less, to suggest opportunities for improvement, as well as to analyze efficiency trends over time and identify causes for the changes. In our research, we measured the efficiency of the secondary education system of 18 selected European Union countries for the period with a three–year sequence interval from 2003 to 2018. To do this, we compiled two models from the available variables and analyzed them using the DEA method. In the analysis, we used cluster analysis, Malmquist index, and Tobit regression to test the three set hypotheses. The results of the first hypothesis showed us that in terms of the level of development, the countries in question show different service modes of operation of systemic secondary education. We also found from the results of the second hypothesis that differences between countries in the technical efficiency of secondary education do not decrease over time, and that countries with lower initial efficiency do not show the trend of moving closer to the efficiency envelope The results of the third hypothesis showed us that changing the level of efficiency of secondary education in selected EU countries is not related to GDP growth and innovation. The overall challenge was a set of easily accessible variables and the definition of two models for analyzing the efficiency of secondary education systems in individual European Union countries. Both the models and the results of the DEA analysis and hypotheses are intended to assist policy makers in determining the efficiency and in determining the finances for the secondary education system in the individual countries considered.
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