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Abstract
In 2010, the CSO has altered the definition of a farm. As a result of this change, there are some research
problems, arising from a significant decrease in the number of farms that meet the new definition. One of them
is the impact of this decline on the regional differentiation of economic size (EC) of individual farms. The aim of
the paper was to evaluate the impact of this decrease on the regional differentiation of economic size of farms.
The analysis covered the year 2010. It is the only year, for which data about the number of farms that meet both
the old one and the new definition, are available. Based on CSO data, for both definitions and for each province
the economic size of average private farm were estimated. Upon the results of the estimation, the ranking of
regions was created. The provinces were also classified and divided into groups. As it was proved in the study, the
change in the definition has significantly affected the regional diversification of economic size. Although ranking
of provinces was only slightly altered, the change of the definition substantially influenced the results of dividing
provinces into groups, regardless of the method of clustering.