Post hoc power analysis:is it an informative and meaningful analysis?

• 作者: Anna Rivera Rita Hedo Rudolph Rull Sabrina Richardson Xin M Tu Yiran Zhang
• 来源期刊: 综合精神医学(英文)
• 学科: 医学
• 关键词: POWER ANALYSIS meaningful ANALYSIS
• 年，卷（期）: 2019,（4）
• 页码范围: 221-225
• 页数: 5页
• 分类号: R

摘要

Power analysis is a key component for planning prospective studies such as clinical trials. However, some journals in biomedical and psychosocial sciences ask for power analysis for data already collected and analysed before accepting manuscripts for publication. In this report, post hoc power analysis for retrospective studies is examined and the informativeness of understanding the power for detecting significant effects of the results analysed, using the same data on which the power analysis is based, is scrutinised. Monte Carlo simulation is used to investigate the performance of posthoc power analysis.