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When "where" is more important than "when": birthplace and birthdate effects on the achievement of sporting expertise 总被引:3,自引:2,他引:1
In this study, we assessed whether contextual factors related to where or when an athlete is born influence their likelihood of playing professional sport. The birthplace and birth month of all American players in the National Hockey League, National Basketball Association, Major League Baseball, and Professional Golfer's Association, and all Canadian players in the National Hockey League were collected from official websites. Monte Carlo simulations were used to verify if the birthplace of these professional athletes deviated in any systematic way from the official census population distribution, and chi-square analyses were conducted to determine whether the players' birth months were evenly distributed throughout the year. Results showed a birthplace bias towards smaller cities, with professional athletes being over-represented in cities of less than 500,000 and under-represented in cities of 500,000 and over. A birth month/relative age effect (in the form of a distinct bias towards elite athletes being relatively older than their peers) was found for hockey and baseball but not for basketball and golf. Comparative analyses suggested that contextual factors associated with place of birth contribute more influentially to the achievement of an elite level of sport performance than does relative age and that these factors are essentially independent in their influences on expertise development. 相似文献
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Joseph G. Eisenhauer 《Teaching Statistics》2009,31(2):42-46
Very little explanatory power is required in order for regressions to exhibit statistical significance. This article discusses some of the causes and implications. 相似文献
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Joseph A. Bonito John Gastil Jennifer N. Ervin Renee A. Meyers 《Communication monographs》2014,81(2):179-207
We investigate the stability and change of participation patterns in small groups by examining two longitudinal data sets at the individual and group levels of analysis. Rejecting the dichotomy between input and process models, we advance a view at the convergence of these two perspectives. We argue that stability in participation reflects input factors and that change emerges from process mechanisms. Study 1 analyzed discussion data from zero-history laboratory groups that worked on three similar tasks in succession, each with stable membership across the tasks. Results showed significant variation within participants and between groups, indicating that group members varied their participation as needed and that group-level factors influenced participation. Study 2 analyzed longitudinal data collected from the Australian Citizens' Parliament, where tasks and group membership varied over time. Study 2 replicated Study 1's findings, but analyses showed more complex patterns of both stability and change across groups and tasks. Taken together, results from the two studies support our position that both input and process mechanisms cause variation in participation. Our Conclusion examines how structural features and participation impact democratic group deliberation. 相似文献
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The long‐term import of a fundamental challenge of adolescent social development—establishing oneself as a desirable peer companion while avoiding problematic behaviors often supported within peer groups—was examined in a community sample of 184 adolescents, followed from ages 13 to 23, along with parents, peers, and romantic partners. The dialectical nature of this challenge appeared in findings that autonomy vis‐à‐vis peer influences predicted both long‐term success avoiding problematic behavior but also more difficulty establishing strong adult friendships. Conversely, being a desirable peer companion in adolescence predicted more positive adult relationships but also greater alcohol use. Adolescents who established themselves as both desirable companions and as autonomous vis‐à‐vis peers were rated as most successful by their parents at age 23. 相似文献