Statistical properties of four effect-size measures for mediation models.

Statistical properties of four effect-size measures for mediation models.
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DOI:
10.3758/s13428-017-0870-1
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发表时间:
2018-03
影响因子:
5.4
通讯作者:
Brown HC
Brown HC
中科院分区:
心理学2区
文献类型:
--
作者:
Miočević M;O'Rourke HP;MacKinnon DP;Brown HC

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本项目考察了在单中介模型和双中介模型中间接效应的四种效应大小度量的经典估计和贝叶斯估计的性能。与比例和比例中介效果大小相比,标准化的中介效果大小测量在单中介模型和双中介模型中相对公正和有效。在单中介模型中,在功率、I类错误率、覆盖率、不平衡和区间宽度方面,对ab/S Y和ab(S X)/S Y的百分位数和偏差校正的Bootstrap区间估计优于对比例和比率效应大小的区间估计。对于双中介模型,标准化效应量测量优于比例效应量和比率效应量。此外,研究还发现,对于某些参数组合,标准化效应大小度量的后验分布的贝叶斯点和区间汇总减少了过度的相对偏差。标准化效应大小是量化中介效应的最佳效应大小。
This project examined the performance of classical and Bayesian estimators of four effect size measures for the indirect effect in a single-mediator model and a two-mediator model. Compared to the proportion and ratio mediation effect sizes, standardized mediation effect-size measures were relatively unbiased and efficient in the single-mediator model and the two-mediator model. Percentile and bias-corrected bootstrap interval estimates of ab/s Y, and ab(s X)/s Y in the single-mediator model outperformed interval estimates of the proportion and ratio effect sizes in terms of power, Type I error rate, coverage, imbalance, and interval width. For the two-mediator model, standardized effect-size measures were superior to the proportion and ratio effect-size measures. Furthermore, it was found that Bayesian point and interval summaries of posterior distributions of standardized effect-size measures reduced excessive relative bias for certain parameter combinations. The standardized effect-size measures are the best effect-size measures for quantifying mediated effects.
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