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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moderated mediation but no moderation?

I have a 2 x 2 between factor design which I analyzed using an ANOVA. I was hoping for an interaction effect to demonstrate moderation which I didn’t get. BUT then I entered a covariate and now I have ...
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7 views

Partial Mediation: why is there a direct effect?

I've got an Interpretation question: I have one independent variable and one dependent variable, which don't correlate. If I add a third variable as mediator there is suddenly a direct effect from IV ...
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5 views

Difference Beta on b-path depending on independent variable (all else being equal)

I hope you can help me with 2 questions: 1. Difference in B-path value I have run a simple mediation with one independent variable on two independent variables with a mediator and a covariate. Here ...
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23 views

Can mediation analysis be done with Cox proportional hazards models?

I am trying to understand what types of open source software projects succeed and stay active for a long time and what types die. I want to use survival analysis because some of the projects in my ...
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1answer
26 views

Possible time-dependent mediation effect in Cox regression

I'm quite new to survival analysis, but would appreciate any advice on how to deal with the following finding in my data analysis/ results interpretation. I have been using R and have used a ...
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13 views

What do we do with suppressor variables?

I have read about the suppression effect at below. Could anyone kindly help to direct what we do with it? Suppression effect in regression: definition and visual explanation/depiction More details: ...
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1answer
29 views

Influential case - to remove or not to remove?

I'm doing a multiple regression analysis with 3 predictor variables (RELAT, SSS and FAITH), and the criterion variable is SSE. I have found that SSS is a mediator between RELAT and SSE, and FAITH is a ...
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23 views

Help with a regression with one mediated path and one non-mediated path

I'm stuck here, and hoping someone can help! I have a simultaneous multiple regression model in which relationship status (RELAT), self silencing (SSS) and subscription to a system of faith (FAITH) ...
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20 views

Quick Mediation Analysis Question

I have a quick question about interpreting a mediation analysis from Hayes' PROCESS macro. After running a mediation analysis, I know that I have full mediation (from the LLCI and ULCI), but I don't ...
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57 views

Is it wrong to do a Linear Regression here?

I'm an undergrad doing an internship in a lab. My statistics background is very poor. I pretty much know what analysis to do on my experiments only because I read this, and I have statistical software ...
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49 views

Help Interpreting Mediation Results Using R Package “Mediation”

So I'm trying to understand the output of the function mediate in R package mediation. I understand the Baron & Kenney four steps approach and how full mediation is established (step four) when ...
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15 views

Multiple mediators, sample size

I wonder if anybody can help me to get the right answer to a question about mediation (using Process). I want to test if Difficulties in Emotion Regulation (DERS) is a mediator between other 2 ...
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17 views

Setting up a mediation model

I'm having trouble understanding how to set up a simple mediation model. IV: hours of sleep M: amount of exercise DV: score on some test I'm expecting the relationship between sleep and test score ...
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1answer
27 views

What do you do when you are not sure which variable is the mediator and which is the independent?

If you have two possible predictors (X and Y) for a given dependent variable (Z) and you suspect that there might be a mediation i.e. Y mediates the relationship between X and Z. However, it is ...
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5 views

Mediation with a dichtomous predictor

Suppose I have a model with a dichotomous predictor $X$ a continous mediator $M$ and a continous dependent variable $Y$. Let's say I have a game that people (randomly assigend) play either with or ...
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1answer
47 views

Mediation Significance

I've run a parallel mediation analysis with bootstrapped confidence intervals and found that one of my three mediators had a significant indirect effect, one mediator was very close to significance, ...
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52 views

Mediation in Multilevel Models using R

I am trying to estimate a mediation models using repeated (over time) observations for the same subjects (firms). I am using lme4 (lmer function) to estimate my models and then attempting to use the ...
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8 views

Testing whether the relationship between a binary IV and Likert DV is mediated by another Likert variable

I wanted to know what the best way would be to examine these variables for a mediating relationship, and if this is possible. The variables are as follows: Independent Variable: Game Motivation = ...
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50 views

Path Analysis Vs Multinomial Logit

Would anyone be able to explain the logic behind using a Path Analysis over running several multinomial logits. The theoretical model I am testing has X1-3 mediating Y1. Y1 and X1 predict U1-3 (the ...
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21 views

Partial Correlation - Quantifying the effect of removing confounding variables on the correlation

I'm conducting partial correlation in order to quantify the association between two variables, X and Y, after the effect of a set of confounding variables Z has been removed from both X and Y. In ...
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64 views

Path analysis and multiple mediators

I have a study with two potential mediators: M1 and M2. I obtain a main effect of my independent variable X on the dependent variable Y. Similarly, I obtain an effect of X on M1, but I do not have an ...
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10 views

Mediation with two categorial IV - Dummy Variable?

I want to calculate a mediation model with SEM (AMOS). I have two categorial IV - low/high status and public/private behavior. I have no clue how to build a dummy variable to check the relationship ...
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44 views

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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43 views

Adding mediation degrades whole model

Updated to a more straightforward question Upfront: Every time one adds a mediation term, should the model fit be expected to degrade? In more practical terms, using lavaan: ...
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50 views

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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1answer
124 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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37 views

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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47 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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41 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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1answer
13 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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21 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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65 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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2answers
145 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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1answer
44 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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774 views

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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14 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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21 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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70 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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28 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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1answer
32 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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27 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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58 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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49 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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1answer
29 views

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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105 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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19 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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1answer
124 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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38 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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38 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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632 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 ...