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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Is it possible to do mediational analysis on trial-level data, including random subject and items factors?

I have words that are rated on several different dimensions. Each of say 30 subjects rates a set of say 30 words. I am curious if some feature of the words is related to some rated dimension of the ...
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20 views

Mediation analysis in spss when there are two mediators having correlation with each other?

i am conducting a research, there are two mediators that are parallel to each other, the point is when i run correlation analysis, these two mediators also show correlation with each other, is there ...
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12 views

Variance explained by indirect effect in repeated-measures mediation analysis

I ran a mediation analysis with a repeated-measures categorical predictor on a continuous DV. As described by Judd, Kenny and McClelland (2001) I first built two contrasts (the categorical predictor ...
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Multilevel mediation with dichotomous outcomes but continuous mediator

I want to do a mediation analysis in R on multilevel data where the treatment and mediator are group-level variables while the outcome is recorded at the individual level. The documentation ...
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20 views

Conduct mediation and moderation in within subject design

I was wondering if someone could help with how to conduct a moderation analysis and a mediation analysis in a within subject (repeated measures) design? I am familiar with the Judd, Kenny, McClelland, ...
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Testing mediation relationship using Propensity score matching

Can I use propensity score matching to test a partial mediation relationship between between three variables, namely dependent, independent and a third variable?
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Describing the causal effect of coffe and heat on esophageal tumor. Interaction, confounding, mediation?

The public health world is discussing in these days the news that coffee is no longer considered carcinogenic but heat of the drinks is the real culprit. I'm trying to visualizing this as a causal ...
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62 views

Help interpreting the output from a mediation analysis

Currently I'm working on some organisational research. Just to get a bit of a idea of what I'm research; I'm looking at impact of leadership on how enthusiastically work. I believe the relationship of ...
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62 views

How do I plot a moderated mediation (SPSS/Excel)? [closed]

I am currently researching the relationship between social media (IV) and body dissatisfaction (DV) in adolescent women, mediated by processes of Social Comparison (M). In my thesis, this mediation (...
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Testing mediation and moderation; can one variable function as both mediator and moderator?

I am trying to understand the relationship between three variables, namely dependent, independent and a third variable I have some theoretical evidence that the third variable has mediation or ...
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12 views

Likert-type mediation on non-normal/non-linear data

I have collected data from a questionnaire with multiple questions, all answer possibilities being on a 5-point Likert scale. After initial analysis, my data does not have a normal distribution nor ...
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18 views

Premises for a mediator effect [duplicate]

if there is no correlation between IV and UV, there can't be a mediator effect by putting a third variable in the model, is that right?
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Mediation analysis: When does the total effect exactly equal direct effect + indirect effect?

Typically in mediation analyses we see diagrams like the following, in which X is the causal variable, Y is the outcome variable,...
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Total Effect is not significant, but Indirect effect is. Is this still valid? [duplicate]

OK, so I ran an experiment with 2 variables and 2 DVs. The theoretical model is that the interaction of these 2 variables (let's call the interaction X) impacts one of the DVs (Y) through the other DV ...
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14 views

Explaining suppression effects in mediation analysis

The study focus is mediational effects of spirituality on the relations between engagement and wellbeing. Rather than the mediator decreasing the relations between engagement and wellbeing when it ...
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22 views

Mediation analysis with a continuous exposure - Lange et al

It's regarding the method proposed by Lange, Vansteelandt et al. for mediation analysis. In their examples, they explain clearly how to conduct a mediation analysis when the exposure variable is ...
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68 views

Generating weights in mediation analysis

This mediation analysis regards how much of the social inequality (as a binary exposure) in long term sickness absence is mediated through physical work environment. The mediator is the logarithm of ...
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17 views

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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17 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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6 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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52 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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37 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 time-...
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17 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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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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28 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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26 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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63 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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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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28 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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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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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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64 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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85 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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10 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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64 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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22 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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91 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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70 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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51 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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96 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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193 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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50 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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45 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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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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23 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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81 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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199 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 ...