When the test of mediation is more powerful than the test of the total effect.
When the test of mediation is more powerful than the test of the total effect.
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当调解的测试比对总效应的测试更强大时。
DOI：
10.3758/s13428-014-0481-z
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发表时间：
2015-06
影响因子：
5.4
通讯作者：
MacKinnon DP
中科院分区：
文献类型：
--
作者：
O'Rourke HP;MacKinnon DP
尽管先前的研究已经研究了调解模型中的权力，但尚未调查调解员的加入会在多大程度上增加权力。首先，一项研究比较了单一中介模型中中介效应与总效应的分析能力，以确定包含一个中介因素会增加统计能力的情况。第一项研究的结果表明，在具有大系数的小样本和具有小系数的大样本中，以及当系数非零且跨模型相等时，包含中介变量可以提高统计功效。接下来，一项研究确定了与平行两个中介模型中的总效应测试相比，总介导效应测试功效更大的条件。结果表明，在大系数的小样本和小系数的大样本中，包含两种介体会增加功效，这与第一项研究中发现的结果模式相同。最后，一项研究评估了顺序（三路径）双中介模型的分析功效，并将检测三路径中介效应的功效与检测总效应检验和单中介效应检验的功效进行了比较。结果表明，三路径中介效应比单中介模型和总效应检验的中介效应具有更强的效力。然后讨论这些结果对研究人员的实际意义。
Although previous research has studied power in mediation models, the extent to which the inclusion of a mediator will increase power has not been investigated. First, a study compared analytical power of the mediated effect to the total effect in a single mediator model to identify the situations in which the inclusion of one mediator increased statistical power. Results from the first study indicated that including a mediator increased statistical power in small samples with large coefficients and in large samples with small coefficients, and when coefficients were non-zero and equal across models. Next, a study identified conditions where power was greater for the test of the total mediated effect compared to the test of the total effect in the parallel two mediator model. Results indicated that including two mediators increased power in small samples with large coefficients and in large samples with small coefficients, the same pattern of results found in the first study. Finally, a study assessed analytical power for a sequential (three-path) two mediator model and compared power to detect the three-path mediated effect to power to detect both the test of the total effect and the test of the mediated effect for the single mediator model. Results indicated that the three-path mediated effect had more power than the mediated effect from the single mediator model and the test of the total effect. Practical implications of these results for researchers are then discussed.
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影响因子：
7.6
作者：
BARON, RM;KENNY, DA
通讯作者：
KENNY, DA
影响因子：
2.9
作者：
Fritz MS;Cox MG;MacKinnon DP
通讯作者：
MacKinnon DP
影响因子：
--
作者：
AROIAN, LA
通讯作者：
AROIAN, LA
影响因子：
7
作者：
Imai, Kosuke;Keele, Luke;Tingley, Dustin
通讯作者：
Tingley, Dustin
影响因子：
8.2
作者：
Fritz, Matthew S.;MacKinnon, David P.
通讯作者：
MacKinnon, David P.