A peculiar prevalence of p values just below .05
A peculiar prevalence of p values just below .05
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DOI：
10.1080/17470218.2012.711335
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发表时间：
2012-01-01
影响因子：
1.7
通讯作者：
Lalande, Daniel R.
中科院分区：
文献类型：
--
作者：
Masicampo, E. J.;Lalande, Daniel R.
在零假设显著性检验（NHST）中，p值是相对于显著性的任意阈值（.05）来判断的。目前的工作检查是否该标准影响心理学文献中报道的p值的分布。我们研究了来自三个备受推崇的期刊的大量论文。不同期刊的p值分布相似。此外，p值在0.05以下的情况比根据其他范围内出现的p值数量所预期的要常见得多。在所有三种期刊中均观察到p值略低于显著性的任意标准的普遍性。我们讨论了这种模式的潜在来源，包括出版偏见和研究人员的自由度。
In null hypothesis significance testing (NHST), p values are judged relative to an arbitrary threshold for significance (.05). The present work examined whether that standard influences the distribution of p values reported in the psychology literature. We examined a large subset of papers from three highly regarded journals. Distributions of p were found to be similar across the different journals. Moreover, p values were much more common immediately below .05 than would be expected based on the number of p values occurring in other ranges. This prevalence of p values just below the arbitrary criterion for significance was observed in all three journals. We discuss potential sources of this pattern, including publication bias and researcher degrees of freedom.