keywords Mediation, mediated moderation, moderated mediation, conditional mediation, bootstrap, Sobel test
All the coefficients in the Mediation
tables are estimated using Maximum Likelihood method implemented in lavaan R package. The betas are obtained as standardized parameters of the path model. They are often called completely standardized effect size indexes . For the indirect effect, the beta is also called index of mediation (Preacher & Kelley, 2011).
If Individual regression
option is selected, the output shows the individual regressions necessary to estimate the mediation model. They show the OLS regression coefficients, usually employed in regression analysis (Baron & Kenny, 1986)
Due to the different methods of estimation, the estimates obtained in the Mediation
tables and in the Individual regressions
tables may slightly vary, although they never differ in a substantial way. The maximum likelihood estimates are more than fine (Rijnhart, Twisk, Chinapaw, de Boer, Heymans, 2017) The purpose of the individual regressions tables is to allow exact comparison with results obtained in R (or other software) using the Baron and Kenny approach.
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