Abstract The Flynn effect describes sustained gains in cognitive performance that have been observed in the past century. These improvements are not evenly distributed, with strong variations across regions or groups. To this effect, we report time and generational trends in IQ development in Romania. Using pooled repeated cross-sectional data ranging from 2003 to 2018 (N = 12,034), we used Hierarchical Age-Period-Cohort Models (HAPC) on data measured with the Multidimensional Aptitude Battery II. The results show an increase in measured performance of about one third of an IQ point per year, mainly driven by individual level effects and with additional variance attributable to generational (cohort) and period effects.

中文翻译：

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罗马尼亚认知能力的时间和代际变化

摘要 Flynn 效应描述了在过去一个世纪中观察到的认知能力的持续提高。这些改进并不是均匀分布的，在不同地区或群体之间存在很大差异。为此，我们报告了罗马尼亚智商发展的时间和世代趋势。使用 2003 年至 2018 年（N = 12,034）的汇总重复横截面数据，我们对使用多维能力倾向电池 II 测量的数据使用分层年龄-时期-队列模型 (HAPC)。结果显示，每年测得的绩效提高了约三分之一的 IQ 点，这主要是由个人水平效应和代际（队列）和时期效应引起的额外差异驱动的。