Abstract. The peak age for professional soccer players is of significant interest to coaches, managers and executives alike. The evidence so far is predominantly anecdotal and subjective. This paper formally analyzes the peak or optimal age in professional men's soccer using performance ratings of players in the four major top flight leagues of Europe. WhoScored.com ratings from 2010/11 to 2014/15 are used. The analysis is done for all outfield players, separately by field position. In addition to simple age distribution and bivariate approaches, a player fixed effects model that accounts for potential selection bias is estimated. The results show that the average professional soccer player peaks between the ages of 25 and 27. In the preferred models, the average forward peaks at 25, whereas the typical defender peaks at 27. For midfielders, the estimated peak age varies by model but still occurs in the 25-27 age band. Defenders experience relatively minimal curvature in the age-performance relationship. Further results show that peak age may vary directly with ability.
The literature investigating unemployment duration in developing countries is rather scarce. In this paper, parametric and semi-parametric models are estimated to analyze the determinants of unemployment duration in a developing country context. Data from a nationally representative urban household survey in Ethiopia are used. The data reveal that mean unemployment duration in urban Ethiopia is very long-3 years for completed spells and 4.7 years for incomplete spells. The econometric evidence shows that the hazard rate into employment is significantly affected by age, marital status, highest level of education attained, location and support mechanism while unemployed. Ethnic background and gender are not found to be important determinants. Appropriate tests show that these results are not driven by unobservable heterogeneities. The nonparametric hazard function and the baseline hazard retrieved from the semi-parametric estimation reveal a unique shape with alternating signs of duration dependence across a range of years.JEL Classification: R23, J64, O55
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