A mediator is a variable that plays an intermediate role in a causal chain. Ie, the 1st variable in the chain causes the mediator, which in turn causes the 3rd variable. Partial mediation is when the 1st variable causes the 3rd both through the mediator & directly.

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2x2 moderated mediation model - how to build the moderator?

Hello friends of statistics, first of all I want to excuse for my bad english skills. Nevertheless I need your help :) My Design: IV-1: social status of person, IV-2: public vs. private shown ...
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Adding mediation degrades whole model

Updated to a more straightforward question Upfront: Every time one adds an interaction term, should the model fit be expected to degrade? In more practical terms, using lavaan: ...
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How to interpret Sobel's test

I have done a mediation test using a Sobel calculator. However, I cannot find how to interpret the output anywhere. Who can help me! The output: Sobel’s Z = 3,33, SE = 0,01, p < 0,001 I know the ...
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What is SPSS Syntax for Hayes' Modmed Process Models-Template No. 9 [closed]

I have a social research model which are: I wanted to analyze it with Process, but I don't know the current right syntax for this problem. Could anyone help me solve this? thank you
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22 views

PROCESS macro in SPSS - Analysis for multiple IV?

I have a moderated mediation model with 4 IVs, 1 mediator, 1 moderator, and 1 DV. I can't find the right model in the templates provided by Andrew Hayes for his SPSS PROCESS macro. Can I carry out one ...
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More precise estimatation of total effect in mediation analysis

Consider an outcome $Y$ that is affected by variables $X$ and $M$, where $M$ is partly determined by $X$, so $M = M(X)$, and consider the system of equations: $$ Y = \beta_0 + \beta_1X + \epsilon ...
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37 views

Testing simple mediation model with two separate outcome variables

I'd like to test whether a variable mediates the relationship between an IV and 2 DVs. The DVs will likely be highly correlated, as they're essentially measuring opposite constructs. Should I do this ...
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14 views

Performing a 2-1-1 multilevel mediation in r

I'm interested in the relationships between the following three variables: religiosity, teleological explanations of daily events, and gratitude resulting from those events. I have collected data ...
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11 views

Undertake mediation analysis when X and M are unrelated?

Does it make sense to test whether the effect of X on Y is mediated by M if X and M are not significantly correlated? And what if M and Y are not significantly correlated either? I know that ...
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19 views

No significant correlation because of two subgroups having opposing correlations

I have found a significant mediation indirect effect (using a user-written macro Process in SPSS) where the mediators significantly mediate the relationship between ...
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33 views

Mediation for mixed model with crossed factors in R

I am looking for a possibility to test for mediation in a scenario where the individual paths (M ~ X, Y ~ M + X) are represented by mixed models with crossed factors (with binary x and continuous m): ...
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81 views

How does one run a meta-analysis on indirect / mediated effects?

I have two different datasets, and am reporting the same mediation analysis in both. The mediation in one study is clear, in the other less so. I am trying to run a small meta-analysis across both ...
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29 views

Mediation analysis with non significant predictor

Hi I am trying a mediation analysis (using library("mediation") in R) My model has 3 predictors and one mediator (n=455), but I am only interested in predictor 1. There is some collinerarity between ...
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What if path c isn't significant, but path a and b are? Indirect effect in mediation

In a classic mediation model, we have , in which the first step of testing the mediating effect of M between X and Y is that X is significantly correlated with Y (as shown in panel A in the figure). ...
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9 views

Overlap in covariates in mediation

I am doing a mediation analyses between two biological factors and cognition, such that factor1 --> factor2 --> memory I want to show that the relation between factor 1 and memory decline is mediated ...
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14 views

Mediation 3 IVs 2 DVs SPSS

What type of analysis would you recommend for examining whether an independent variable mediates another variable which mediates another variable which affects 2 different dependent variables? E.g. ...
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54 views

Simulating data for mediation model

There is a prior question here, but it doesn't quite cover what I need. I am trying to simulate a scenario with 3 variables in a mediation setup and with measurement error. All variables must be ...
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16 views

Quasi-Bayesian Confidence Intervals for Mediation in R: Distribution Assumptions

Please apologize for this potentially "stupid" question. But I am currently attempting to test a mediation in for a multilevel dataset. Unfortunately, the residuals of the regressions do not follow a ...
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24 views

Mediation through multiple regression when you have 2 or more than 2 IVs

I have 4 IVs 1 MV and 1 DV. The literature i have gone through to test mediation through path analysis (SPSS) only illustrate inclusion of 1 IV 1 MV and 1 DV. Is it possible to first check undertake ...
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19 views

Interpreting Mediation Output when Direct Effect is not Stat. Sig but ACME and Total are

The mediation package in R returns results in which: Average Direct Effect (ADE) (the unmediated effect) is not statistically significant The Average Causal Mediated Effect (ACME) (the effect of the ...
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39 views

bootstrapping for testing indirect/mediation effect

I am quite new in mediation analysis and especially using mixed models. I would like to test a mediation analysis (bootstrapping) for mixed models and I find it quite challenging. My outcome (Y) is ...
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33 views

Combination of lme/lmer with clmm2 when running mediation

I was wondering whether it is possible to combine a cumulative link mixed model (clmm2) with the linear mixed model (lme4/nlme) when running a mediation (package mediation). I have been working with ...
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I have done a Hayes Mediation analysis with 2 mediators. My indirect effect is very small but significant. How do I interpret this?

I looked at the Effect of ADHD on Global Seasonality Score (GSS), mediated by both Sleep onset time on Free days and Sleep duration on Free days (N= 1738). The indirect effect of ADHD on seasonality ...
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48 views

Mediation analysis for ordinal DV, categorical IV and continuous mediator

I want to do mediation analysis on my data and am a bit confused about how to interpret the results of my analyses. My data looks like this: X = The only IV, which is dichotomous. Y = The only DV, ...
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17 views

Indication for potential mediation or moderating relationships

I want to run a regression with many variables. Besides the hypothesized direct relationships between IV and DV, there might be some moderating and mediating relationships (but I don't know which) ...
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42 views

Inconsistent mediation in my mediation model

The direct effect of WE is 0.758; while the indirect effect is -.19; that leads to total effect of .46.....I need to know as inconsistent mediation means opposite signs between direct and indirect ...
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29 views

How to structure dataset and write syntax for mediation model with clustered data?

I have a dataset of 300+ students with teacher-reported data. There are 17 total teachers that reported data on the students. I would like to run a model that tests mediation where the mediator is a ...
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33 views

Outliers for Spearman's Rho Correlation and Mediation

My research project is sort of a two parter. First of all I look at the correlation between one type of schema in women and five types of schema in men. The data is not normal or linear so I have to ...
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235 views

How to calculate effect size Kappa Squared for multiple parallel mediators?

I was using the function mediation() from the package MBESS to calculate κ2 (kappa squared) as the effect size for a single mediator model. How can I calculate κ2 ...
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28 views

Why does the direction of a coefficient reverse when accounting for a moderation interaction?

I'm conducting a moderated mediation analysis. On their own, the bivariate correlation between X and M is positive. However, when I calculate the full path analysis with the moderator (W), the ...
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27 views

Mediation Analysis using PROCESS by Dr. Hayes

I have one one concern regarding the range of confidence interval when I do a mediation analysis using PROCESS model 4 by Dr. Hayes. The result of the mediation analysis indicated that indirect ...
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128 views

Multilevel moderated mediation with multiple mediators in MPLUS

I'm trying to assess a 1-1-1-1 multilevel model with a cross-level interaction at path a. The moderator is the group mean of one of the level-1 predictors. I'm confused about how to model this and how ...
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32 views

Understanding my serial mediation from R and creating a serial mediation model

I am having trouble understanding my serial mediation results from R. I think that my results are significant, but I'm not sure how to create a model using my results. Can R create the model on its ...
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185 views

Using and Interpreting Moderated Mediation with PROCESS Macro

I'm trying to look at a moderated mediation analysis using the PROCESS macro in SPSS, but there are several ways I could do this and I'm not sure what would be best or how to interpret the results. ...
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mediation hypotheses

I am examining a loyalty program's (LP) effectiveness on customer loyalty across members and non-members. I first hypothesised members will perceive higher levels of switching costs (SC), and exhibit ...
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24 views

Mediation analysis output in r

My question relates to the mediate function summary output in the mediation package: how does the function distinguish between ADE treated and ADE control? I thought the direct effects will only occur ...
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Mediation help!

Can I use culture(categorical, 3 levels) as mediator? IV=Life satisfaction (continuous), DV=Attitudes to women(continuous)? Suspect not because AtW does not predict culture? Also if I wanted to see ...
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44 views

Interpreting Sign of Mediation Analysis

I am new to mediation analysis. I am analyzing observational data, specifically, congressional races between 1980 and 2008. I am examining whether the effect of congressional partisan votes on an ...
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507 views

R - moderated mediation using the lavaan package

I am interested in determining the conditional indirect effects of X on Y at a series of values for a third variable Z. I was able to use the lavaan package to calculate some initial indirect ...
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15 views

serial mediation with count data

It seems that, when you have count data, OLS-based mediation analysis models are not the right option to use. Poisson based strategies would be better. But I dont know about any software using poisson ...
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71 views

If x2 & x3 affect x1, & x1 affects y, should x2 & x3 be included in a regression model?

Let's consider the regression $y=x_1+x_2+x_3+\varepsilon$ It is known that $x_2$ and $x_3$ affect $x_1$, but $x_2$ and $x_3$ do not affect $y$. $x_1$ can affect $y$, but only to a small extent. The ...
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Multiple mediation analysis

I have a question about multiple mediation analysis. I had originally designed a study to see if four separate variables (M1, M2, M3 and M4) mediate the relationship between an independent variable X ...
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111 views

Inconsistent mediation

I am trying to figure out how to interpret my data where I think I have inconsistent mediation (MacKinnon, Fairchild & Fritz, 2007). Before including covariates: I have a non-significant total ...
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12 views

Mediation with mediator measured at the same time as response

I have four variables, Var1T1, Var2T1, Var1T2, and Var2T2. The two "Pre" variables were measured at the same time and the two "Post" variables were measured at the same time. It is clear to me that I ...
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302 views

Can we make mediation analysis with ANOVA?

I conducted mixed ANCOVA for my research. However, I need to make a mediation analysis as well. I have no idea of converting a mixed ANCOVA with many control variables into a regression. Can't I do ...
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16 views

Regression with Mixed Factorial Design Experiment

I have a 2 x 2 mixed factorial design experiment. I already conducted ANOVA. However, I need to make a final mediation analysis. I will apply Baron and Kenny's steps. So, I need to conduct a ...
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1answer
17 views

Total effects read the same in mediation analyses

I was trying to conduct a mediation analysis to assess the effects of three different mediators between the IV and the DV. However, despite the a paths, b paths and c' paths being different for all of ...
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1answer
27 views

Mediator reverses direction of causal variable. How to interpret?

I'm running a mediation in SPSS as per Baron and Kenny's guidelines (using regression). X is a dichotomous variable; M and Y are continuous. Step 1) X-->Y (r = .07, p = .03) Step 2) X-->M (r = .45, ...
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23 views

Preacher & Hayes mediation 'model summary for dv model'

I have a (probably very stupid) question. I am doing a preacher & hayes mediation analysis on my data, but was wondering what the values for 'model summary for dv model' mean. I tried google but ...
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232 views

Power analysis for regression with multiple mediators using bootstrapping (PROCESS)

I am currently trying to help a friend of mine with some statistical analyses for her master project, and she has come up with this question, which might be of interest to others (wel'll see) and to ...