在注意力,执行功能和隐式学习方面的效果大小估计中的量化错误
Kelly G Garner1, Christopher R Nolan2, Abbey Nydam3
1School of Psychology, University of Birmingham.
概括
在心理学研究中,小样本大小导致不准确的效果大小估计,可能会使信息丢失增加一倍. 根据先前对小N的研究进行功率计算是不可靠的,这凸显了需要更大的样本的需要.
科学领域:
- 认知心理学 认知心理学
- 心理学研究方法论心理学研究方法论
背景情况:
- 准确的效果大小量化对于科学进步和有效的资源分配至关重要.
- 出版偏差和小样本大小 (N≈25) 损害了当前影响大小估计的可靠性.
研究的目的:
- 评估样本大小如何影响影响大小估计错误的注意力,执行功能和隐性学习范式.
- 根据现有的效果大小估计,评估功率计算的可靠性.
主要方法:
- 一个大数据集与引导相结合,模拟了1000个实验,跨越了各种样本大小 (N=13-313).
- 分析的重点是量化效应大小,统计能力和信息丢失.
- 该研究检查了功率计算的精度,并确定了错误估计的预测因素.
主要成果:
- 使用较小样本大小 (下N) 的实验可能会导致信息丢失的两倍或三倍.
- 基于类似研究中的效果大小的功率计算,在常见样本大小的情况下,不准确的时间为40%-67%.
- 对主体间行为效应的倾斜性成为错误效应大小估计的预测因素.
结论:
- 小样本大小显著增加了不准确的效果大小估计和不可靠的功率计算的风险.
- 建议研究人员考虑更大的样本大小和效果大小估计变量的潜在影响.
- 模拟方法提供了有价值的理论见解,包括从否定零假设中获得的信息和个人变化的估计误差中的作用.
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