Regular biography
Valentin Zelenyuk is a renowned researcher in the field of productivity and efficiency analysis. He has made significant contributions to the theoretical and applied aspects of data envelopment analysis (DEA), stochastic frontier analysis (SFA), and nonparametric methods. His work often focuses on the aggregation of efficiency and productivity measures, the statistical inference of efficiency indices, and the application of these methods to real-world problems in economics, management, and public policy. Zelenyuk has published extensively in top-tier journals such as the *Journal of Productivity Analysis*, *European Journal of Operational Research*, and *Annals of Operations Research*. He is also known for his collaborative work with leading researchers in the field, including Rolf Färe, Shawna Grosskopf, and Leopold Simar.
Scholar-generated biography
Valentin Zelenyuk is a researcher specializing in productivity and efficiency analysis, nonparametric econometrics, bank performance, and healthcare. His work focuses on measuring productivity and efficiency using advanced econometric techniques such as data envelopment analysis (DEA) and stochastic frontier analysis. Zelenyuk has explored the performance of financial institutions, including banks and hospitals, with an emphasis on factors influencing efficiency and technological change. His research also addresses statistical inference and methodological advancements in frontier analysis, including truncated regression and double-bootstrap approaches. His studies often apply these methods to real-world contexts such as banking systems and healthcare services.