Mediation analysis using sobel test for one indirect effectZhiyong ZhangLijuan Wang
2. Use either theSobel testorbootstrappingfor significance testing. 以下是Baron&Kenny(1986)提出的mediation analysis的基本步骤。mediation analysis由三组回归组成:X→ Y、 X→ M、 和X+M→ Y.这篇文章将展示使用R的例子,但你可以使用任何统计软件。它们只是三个回归分析! # Download data online. This i...
library(multilevel) ?sobel sobel(Meddata$X, Meddata$M, Meddata$Y) Sobel 测试使用专门的 t 检验来确定在 M 存在的情况下,X 对 Y 的效应是否显著减少。使用 sobel 函数将为您提供之前运行的三个基本模型(Mod1 = 总效应;Mod2 = 路径 B;Mod3 = 路径 A),并提供间接效应的估计值、标准误差和 z 值。
The Sobel mediation testB. Wang
though bootstrapping has been introduced for the mediation analysis in regression models, the approach is perfectly suited for the PLS-SEM method as well. In addition, bootstrapping the indirect effect yields higher levels of statistical power compared to the Sobel (1982) test (Zhao et al.,...
An alternative for bootstrapping that does come up with a p-value here is the Sobel test.PROCESS also reports the standardized b-coefficient for abab. This is usually denoted as β and is completely unrelated to (1 - β) or power in statistics. This number, 0.04, is known as the ...
> > change practices. I am getting an odd result when running a Sobel > > goodman test in Stata with regards to the portion of total effect > that > > is mediated (5.139). Does anyone have any perspective on why this > > number is so large? Running the same test with another set...
Mediation analysis can be used to test and refine the theoretical hypothesis underlying an intervention. In particular, it can examine whether the intervention results in changes in the constructs that it was designed to target, and whether these changes result in improved treatment outcomes (Kazdin,...
Difference in coefficients approaches capitalize on the first equality for Δ while product of coefficients ap- proaches including Sobel's test capitalize on the second equality. The assumptions underlying these tests can be questionable, and so the test based on the bootstrapped confidence interval (...
The results of the Sobel test were statistically significant (P < 0.001). The analysis of KHB composition indicated that the two agents decreased the overall impact of family health on smoking by 17.00%. Furthermore, the moderating impacts of extroversion and anxiety accounted for 47.81% and...