Questions tagged [mediation]

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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Interpretation of indirect effect in SEM

Ancillary units have lesser probability of accessing formal finance (-0.027). But, through profitability, the indirect effect Ancillary unit has on Formal Funding is positive and significant at 1% ...
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Why the mediated effect is the result of the multiplication between the slope of IV to mediator and the slope of mediator to DV?

My question is, why the average causal mediated effect (ACME) can be calculated as the two coefficients that represent the slope from the independent variable to the mediator (simple regression model) ...
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Mediated Moderation or Moderated Mediation?

let's say I have two groups (variable G) and another variable such as stress (variable M). The two groups differ within stress. Now I want to examine how the relationship between freetime (variable X) ...
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Mediation Analysis with Interaction of Mediators

I am not an expert in mediation analysis or structural equation modelling. I looked in the standard reference for mediation analysis (i.e., Hayes) and searched the forum and internet a bit and could ...
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Mediation with hierarchical regression using STATA

I had run the mediation test using hierarchical regression. My sample is comprised of two years of data with a total of 976 companies. Question: Do I need to run the bootstrap in the mediation ...
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How to intrepret one significant and one insignificant mediator and a significant direct effect in PROCESS?

I have conducted a mediation analysis with two mediators using PROCESS. My findings are that in X -- a --> M1 -- b --> Y, a and b are significant. However in X -- c --> M2 -- d --> Y, only d is ...
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Mediation analysis with all binary variables

I am seeking to run a mediation analysis on a dataset in which the outcome variable, the mediation variable and the main input variable are all binary. Is this going to be possible? If so would anyone ...
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36 views

Bootstrapping for mediation in multilevel model with binary outcome

I am trying to do a mediation analysis with a multilevel model, where the outcome is binary and the predictor and mediator are continous. I wanted to do bootstrapping and then comparison of confident ...
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1answer
28 views

Hayes Mediation Tables with binary outcome variable

I am trying to put together mediation tables for my study which has a binary outcome variable. Normally, I report the R-squared and F statistics for my mediation model. However, SPSS Process does not ...
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1answer
25 views

Significant total and indirect effect but insignificant direct effect [duplicate]

I was trying to use a simple mediation model (the classic triangular model) to test my hypothesis. However, my data exhibited a significant total effect and a total indirect effect, with the direct ...
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18 views

R mediation package: Different outcomes depending on treatment and moderator

I recently ran some moderated mediation analyses with the R package mediation. The code was as follows: ...
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28 views

How to run a moderated multilevel mediation in R?

I am trying to run a moderated multilevel mediation in R. I have encountered the mlma and bmlm packages, as well as Elizabeth Page-Gould's open-source code for testing indirect effects in multi-level ...
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58 views

Multiple Linear Regression with Mediator in SPSS

My variables (all continuous): IVs: Secondary Traumatic Stress and Vicarious Traumatization DV: PTSD Mediator: Social Support I checked the correlations between the variables and they are all ...
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Mediation analysis Baron and Kenny

I would be very grateful if someone could advise me as to why the indirect effect in this type of mediation analysis is made up of the product of a and b as opposed to the sum of a and b. Thank you ...
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Interpretation of Total Effects, Direct Effects and Indirect Effects (Pearl, 2012)

Pearl (2012) introduced a Mediation Formula to assess mediation effects in non-linear models. I would like to ask how to interpret the results if the Total Effect (TE) is negative, but both the Direct ...
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Question about the direction in mediation analysis

My question is about mediation analysis and I am new to this statistical technique. In mediation analysis we usually assume following relationship, So we want to test whether the relationship ...
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1answer
16 views

Mediator variable turn insignificant in the c' relationship

Dear all, I am currently running a mediation analysis and I'm running into some trouble interpretting the insignificance of the variables. - When running a regression for path A, this is significant ...
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Mediation analysis in R not showing values for treatment/control group

I'm using the mediate function in the mediation package to carry out my analysis. However, when I run my code, I do not get ...
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1answer
50 views

In stepwise regression, how to interpret non-significant variables? [duplicate]

I have more than 15 IVs such as age, gender, education, first language, technology proficiency, health condition, etc, and one of my DVs is health literacy level, which is measured through a standard ...
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How to do within group moderation analysis without subsetting data

Let's say I run the following regression specification: lm(outcome ~ treatment) Where treatment is a factor variable that can take four values ...
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21 views

How does Mediation Analysis Account for Covariates

Can anyone explain how mediation analysis accounts for covariates? For example, when I run a simple mediation analysis with X predicting Y mediated with M -- what happens when I specificy PROCESS ...
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22 views

Mediation Analysis Adjusting for Covariates

I am attempting to perform a simple mediation model. I must include covariates to control for Y (the outcome). Already we have determinants for this outcome Y (age, gender, BMI, Race). These "...
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50 views

Is it ok to use control variables in a moderator/interaction analysis in experimental design?

I have a question concerning the inclusion of control variables into my research. I have data from an experimental, randomly distributed social protection program. I want to test whether a moderating ...
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34 views

What are the best techniques for mediation analysis?

I am running a model of the following form: lm(outcome ~ treatment) in which I cluster standard errors at the participant level. I ask respondents at the end of ...
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39 views

Mediation analysis for multilevel repeated measures designs?

I have a burning question regarding mediation analysis for multilevel repeated measures designs. I have a design in which groups of three participants (multilevel) discussed one time FtF and one time ...
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37 views

Mediation and centering

I am running a mediation model with 2 interaction terms (gender x happiness and gender x hours spent working per week) and one dependent term (income). I am wondering if I should mean center these ...
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14 views

Getting significant between effects in mediation despite low ICC

I am interested in examining between effects using lmer in a mediation model using mediation and within effects using ...
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31 views

Using the PROCESS macro to analyse mediation in a longitudinal data set with three points

I am investigating whether a parenting program reduces child anxiety via improving parenting practices. Initially, I answered this research question with two time points of data. After submitting the ...
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Questions about the mediation analysis of ordinal logistic regression

I have two questions about mediation analysis in R. First, I have three variables, Group_A (X), Group_B (mediator), Group_C (Y), and all of them also have three levels, 1 2 3. When I run the below R ...
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Should I compute my scales by averaging or total score?

I am conducting a research involving a serial mediation analysis using Hayes's Process (Model 6). Should I compute my scales by average or by total score? It doesn't make a difference considering ...
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19 views

Evaluating mediator effect, through SEM model selection with AIC [duplicate]

I am new to SEM and the lavaan R package, so perhaps this is a basic question. I have social media data with three variables: ...
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1answer
50 views

PROCESS macro or SEM for mediation model with latent variables

I am conducting a survey to analyze the effect of a binary variable X on a latent variable Y. The effect is assumed to be mediated by another latent variable M. Moreover, the effect of X on M is ...
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9 views

Mediation analysis if I have 2 mediators

What mediation analysis should I use if I have two proposed mediators for my intervention, and want to account for the time factor?
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198 views

Dummy variables in two-way ANOVA

I do not understand how to use dummy variables and the statistics underlying them. I don't need to apply this or use it in SPSS or any software. I do know that they can be used for categorical ...
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1answer
31 views

How to interpred medflex mediation results?

I have the following dataset of 108 samples: ...
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1answer
32 views

Interpreting coefficients in a regression model for a two-level categorical IV [closed]

I'm running a moderated mediation analysis in SPSS. However, I face some difficulties interpreting the results. I have one independent variable which has two levels (emotional and rational). Since I ...
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How to assess whether the couples are significantly more correlated with their partners than other study participants?

I am looking for statistic advise. I have a small sample (86 participants) of which 30 are husband and wife (15 couples) and the rest are either single or have a partner but the partner is not in the ...
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70 views

Help interpreting a mediation analysis please

I am doing a mediation analysis using PROCESS, and need some help with the below. My X = Adverse childhood experiences; Y = meaning (as part of a measure of wellbeing) and my mediator is resilience. ...
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1answer
253 views

Moderation analysis with non-significant main effects but significant interaction

I am doing a simple moderation analysis with one independent variable (IV), one moderator (M) and one dependent variable (DV). Results indicate that a regression model containing both main effects (...
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17 views

Moderated mediation with Hayes PROCESS

Is there a way of using Hayes PROCESS for a mediation analysis, if I have three interacting categorical independent variables (with two levels each), 1 mediator (continuous) and 1 outcome variable (...
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1answer
43 views

What statistical analysis should I use for comparing multiple variables at different time frames? (psychology experiment)

I'm planning a longitudinal psychology experiment where I want to compare levels of different variables over the course of an 8-week treatment. i.e. I want to see any increase/decrease in variable A, ...
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65 views

Linear Mixed Model Failing to Converge

I am attempting to run a Multilevel Mediation in R with overtime data (4 time points, 50 participants). I was hoping to create two new columns for each outcome and predictor variable, a baseline ...
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24 views

Moderated mediation with multiple independent variables

I want to do a 2 x 2 x 2 between-subjects design. Each independent (categorical) variable has two levels. I have one mediator (continuous) between the independent variables and the dependent (outcome) ...
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41 views

Mediation models using multilevel, longitudinal data

This is my first time working with longitudinal data and could use some advice about how to use the "time" variable in mediation analysis. I conducted a longitudinal study with fixed occasions (...
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55 views

Mediation model of time series data

I'm quite new to mediation analysis so hopefully I can clearly explain my problem. I wish to conduct a mediation model with a single mediating variable. The independent variable is a time series EEG ...
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16 views

Mediation with three mediators

Constructs: 1. Humility: Independent variable 2. Personal attitude: Mediator 3. Subjective Norm: Mediator 4. Perceived behavioural control: Mediator. 5. Intention: Dependent Variable Problem: When ...
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157 views

Interaction between dependent and independent variable

I am conducting a multiple linear regression on data from a cross-sectional study, and I suspect that there is an interaction between my dependent variable (a disease risk marker) and one independent ...
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24 views

Moderated mediation included in a bigger path diagram

I want to specify a path diagram with 7 (observed) variables. It includes the following two relationships: b ~ a; c ~ a+b. Analyzing these three variables separately, it is possible to define a ...
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1answer
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Testing for mediation

Is it possible for mediation to have occurred via establishing the four steps specified by Baron and Kenny, yet for the Bootstrapping method to indicate no significant mediation effect occurred?
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how to use lavaan for multiple regression mediation

I am using Lavaan for mediation as it is very easy to customize your work but i am confused about indirect effect and total effect in case of multiple regression Example: ...