This newspaper’s comprehensive foreign media reports The German journal "Higher Education" recently published the director of the Institute of Advanced Studies in Social Sciences and Humanities at Adam Mickiewicz University in Poland、Article co-authored by Professor Marek Kwiek, Director of the Institute of Public Policy, and Wojciech Roszka, Assistant Professor, Department of Statistics, University of Economics and Business, Poznań, Poland "Once Highly Productive，Always productive？The Bet365 lotto review productivity of full professors from the perspective of longitudinal research》。Research findings，On a personal level，Productivity levels of scientific researchers generally do not change significantly throughout their careers。

The study is based on the data of Polish scientists in the scientific article abstract and citation database "Scopas"，Examined 14 STEMM (Science、Technology、Engineering、Mathematics、Academic careers of 2326 Polish full professors in the disciplines of medicine - their promotions over 40 years and the articles published between each promotion。In this study，Bet365 lotto review productivity is classified as high、中、Three lower intervals；Considering the “stratification” of Bet365 lotto review results，Articles published in high impact factor journals are more weighted than articles published in low impact factor journals。

Analysis display，52.6% of highly productive assistant professors become highly productive associate professors，50.8% of highly productive associate professors later become highly productive full professors。Bet365 lotto review productivity dropped from high range to low range，It may be very rare to rise from a low range to a high range，Only 4 of current full professors.3%。Logistic regression model shows，Becoming a highly productive assistant professor and a highly productive associate professor increases the probability of later becoming a highly productive full professor by 79% and 261% respectively，Gender and age factors have little impact on the statistical results。

Kovic and Rozka said，The above findings provide important reference for the recruitment policy of scientific researchers。Since Bet365 lotto review careers often last for decades，Hire scientific staff with different productivity levels，will have a profound impact on the institution where he works and even the national Bet365 lotto review system。

　　（Wang Youran/Compiler）