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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Conceptual Question Re mediation analysis [duplicate]

I previously posted about this but no one answered my question. I am reposting as I am hoping someone out here will be able to provide an answer or at least an opinion. Please note, I will also cross ...
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57 views

Is there evidence of mediation? Need help with interpretation of mediation analysis results

I have performed a mediation analysis. I have an independent variable T, a mediator M, and outcome Y. (All 3 variables are binary, and I use logit.) (While I used Stata ...
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1answer
24 views

Complete mediation (Preacher Hayes)

Below is the output of my bootstrap model (Preacher & Hayes, 2008). Path a, b and c are ...
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13 views

multilevel mediation with a proportion dependent variable sem

I am attempting to test an indirect path in a multilevel dataset with an outcome that is a proportion. The data are a collection of variables related to various qualities of potential support ...
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17 views

Is it Complete or Partial mediation? Or no mediation at all?

Kindly explain the given situation, is it partial, complete, or no mediation at all?
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20 views

Mean centering variables NOT in a moderation/interaction term [duplicate]

I am trying to assess the impact of multicollinearity in a regression because I have two separately measured variables which have the reversed signs problem (one predictor is +b regression weight, the ...
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12 views

What effect, if any, do outliers have on mediation analysis with bootstrapping?

I am running a mediation analysis spread over 6 models. Analysis is performed using the PROCESS macro. Each model includes 1 IV, 2 parallel mediators, and 1 DV. In a couple of the IVs, a number of ...
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12 views

Mediation analysis when IV and DV are dichotomous variables and a mediator is a continuous variable

I found a significant association between my dichotomous IV and my dichotomous DV using CrossTables and looking at Chi Square. Now I am interested in finding whether this association is mediated by a ...
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16 views

Mediation analysis using Bootstraps

I have used Hayes' plugins (PROCESS and INDIRECT) in SPSS. My result shows that all four paths (a,b,c,and c') are significant i.e. have a p-value of less than 0.05. In all the examples I have ...
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21 views

Multiple Mediation Analyses in Model

Hi everyone, I'm currently in the process of finalising my honours thesis in Psychology and have run some preliminary analyses testing for mediation. I was wondering if it is theoretically ...
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43 views

Need to transform data before running mediation/model with bootstrapping (PROCESS)?

I am reading through Hayes' book on mediation and moderation analysis (2013) which describes the PROCESS macro he created to use bootstrapping in order to arrive to confidence intervals to check the ...
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3answers
523 views

Is Baron and Kenny method for mediation now outdated?

Is Baron and Kenny method for mediation now outdated? This is because I got a comment from reviewer saying asking me to refer to Rucker, D.D., Preacher, K.J., Tormala, Z.L. & Petty, R.E. (2011). ...
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30 views

Is this mediation or a simple path?

This is my model adapted from a study. I want to know whether I can only study it as a path analysis without studying mediation effect (1 $\longrightarrow$ 5 direct effect, as well as indirect ...
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50 views

Generating non-normal correlated data for mediation analysis?

For a simulation study I have to generate data according to a trivariate mediation model (Baron & Kennys causal step approach). Assuming $X$, $M$, and $Y$ are continuous variables of sample size ...
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14 views

Mediation and moderation in labeling

So I'm looking at student stigma affecting self-esteem. The overall idea is that stigma affects student achievement through the mediator self-esteem, so I will do multiple regressions and test for ...
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2answers
140 views

mediator or moderator variable?

I have been given a set of data and I am confused as to whether one of the variables is a moderator or mediator variable. The hypothesis is that stress and well-being have an inverse relationship. ...
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1answer
57 views

How to determine whether an indirect effect is statistically significant using Bayesian statistics?

I've used bayesian estimation to test the indirect effects within a model and identified 95% credible intervals. I'm typically used to using the Sobel's z test to identify significant mediation, what ...
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1answer
45 views

testing for mediation of interactions

I am somewhat familiar with various ways of testing mediation for factors in different types of regression analysis. (I'm using R and currently working with a multilevel binary logistic regression.) ...
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24 views

SPSS mediational analysis help

I'm doing a psychology project and I'm struggling with statistics (SPSS) especially on meditational analysis. I have searched all over my notes from my bachelor degree but there is nothing on ...
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1answer
155 views

Variable A predicts B, variable B predicts C

I have pre - post data on quality of life, depression, and self-esteem. I hypothesize that changes in self-esteem from pre to post cause changes in depression, which in turn cause changes in quality ...
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22 views

How to check mediating effect of categorical data

Kindly suggest a statistical test in SPSS for the following type of model: X = dependent variable (categorical with 3 categories) Y = dependent variable (scale) M1 = mediating (categorical with 3 ...
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52 views

Moderated mediation: moderator only in M equation

I am interested in taking the following model to my data: M = X + Z + XZ Y = X + M Where Y = outcome; M = mediator; X = treatment; Z = moderator; XZ is treatment-moderator interaction This ...
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1answer
217 views

Comprehending output from mediation analysis in R

I'm trying to get my head around the mediation package in R, using the vignette for the package. I'm struggling to understand the output of the mediate() ...
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2answers
219 views

mediation analysis when mediator is categorical (SPSS)

I want to do a mediation analysis, with the following variables: ...
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48 views

Mediation analysis with two waves of data in AMOS

Does anyone know the best way of carrying out a mediation analysis when the IV, mediator and DV have all been measured at two time points? I'm wanting to do this using SEM in AMOs.
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2answers
204 views

What test should I perform on a structural equation model?

This model is a replication of an earlier study. After factor analysis in SPSS, I need to test my hypothesis (as you can see there are 7) all should give significant positive relation with each ...
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47 views

Mediation on an interaction with dichotmous mediator

We are using Tingely et al's mediation R package for mediation analysis. Our study is a 2x2 design, say A (0 and 1) and B (0 and 1), with dichotomous mediator M and continuous dependent measure Y. Our ...
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48 views

Mediation using 'mediate' in R with an interaction

I have a question about mediation when there is an interaction between 2 categorical variables, one with two levels and one with three levels. Using the ‘mediation’ package by Tingley and colleagues ...
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31 views

Significance of mediation

I have some trouble understanding the mediator analysis I just conducted. I used the Sobel macro of Preacher & Hayes (2004) for SPSS. The results look like this: DIRECT AND TOTAL EFFECTS         ...
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51 views

Effect size for indirect effect with a binary outcome

Is it possible to obtain the effect size of a mediation with a binary outcome? I am looking to report an effect size specifically for the indirect effect. I have already reported the effect sizes of ...
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47 views

How to test for mediation with a continuous mediator and DV, but a categorical predictor?

I want to explore whether attitudes mediate the relationship between employment status and intention to apply to graduate school. (See image below). I planned to use the Sobel Test to explore the ...
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92 views

competitive mediation explanation

I did a simple mediation analysis using PROCESS (attached). The result is all significant however the path "b" or M -> Y is negative. I've read somewhere, Zhao et al., that this is called "competitive ...
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18 views

Should I include multiple mediating variables in the same analysis?

If the answer is "it depends", what does it depend on? I have three mediating variables, one predictor variable and one outcome variable. I have observed that the results I get when I run three ...
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29 views

SPSS macro for mediation in small samples?

I need to test mediation with two quantitative variables and a dichotomous outcome. I have found a good tutorial on that topic, after calculating all need values it says that I should run a Sobel test ...
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52 views

Mediated, moderated mediation?

I have a significant effect of interaction $AB$ in $Y = A + B + AB + covariate$ Is it possible to do a mediation analysis to see if $AB\rightarrow Y$ is mediated by $A\cdot covariate$? Is it valid ...
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1answer
256 views

How to analyze unequal samples in linear and multiple regression

I have three variables (sample size is mentioned below), and I want to analyze data using regression models as recommended by Judd and Kenny (1981) to see if $cc$ mediates the relationship between ...
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106 views

Regression model for prediction using intermediate outcomes

Is it appropriate to include intermediate outcomes in a predictive model? It is quite clear that one should not control for post-treatment variables / intermediate outcomes when the goal is causal ...
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37 views

Can you create a composite score (e.g. index) out of scales that form a mediated model?

I have a mediated model of decision making with three elements - values, attitudes and intentions. The relationship between values and intentions is mediated by attitudes. Each element is measured ...
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1answer
72 views

How to test whether the effects of predictors on one DV explains their effects on another in a mixed ANOVA in R

I have data from a psychology experiment in which instructional method was manipulated between subjects via two factors: pretraining (3 levels) and training (2 levels). I assessed participants' ...
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2answers
195 views

A question on SEM and path analysis

For my PhD dissertation, I am offering a conceptual model on teacher professional development. My model has one mediator. I wonder if I can test the mediation through Baron and Kenny's procedure or ...
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1answer
102 views

multiple measures mediation analysis

I want to know how to do a mediation analysis with repeated measures. Here is a fake experiment that has the same form as the one I plan to do (using a fake one lets me simplify some weird ...
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179 views

Can I use ANCOVA for mediation analysis?

I'm a student of psychology and currently drafting the experimental design for my thesis. I could really need some help with the following statistical question. In my experiment, participants will be ...
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19 views

IV and Mediator have reciprocal relation

I am trying to create a mediation model for: X1=employee capability; X2 (Mediator)=Company capability; Y= employee earnings Although, I am not sure if I can still say that this will be a mediation ...
4
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1answer
99 views

Sobel test with survey data

I would like to ask if there is any problem / concern with Sobel test when I use survey data? In particular, I was using the web-based calculation tool here based on coefficients derived from ...
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1answer
137 views

Simulating data to fit a mediation model

I am interested in finding a procedure to simulate data that are consistent with a specified mediation model. According to the general linear structural equation model framework for testing mediation ...
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306 views

Interpreting a mediation model with binary outcome

I have a mediation model with two continuous mediators (m1; m2), a continuous input variable (x) and a dichotomous output variable (y). The two mediators are different mechanisms of the input ...
2
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1answer
117 views

A regression decomposition for dummy variables

Suppose that I have a regression model \begin{align} Y = X\beta_X + Z_1 \beta_{Z_1} + Z_2 \beta_{Z_2} + \varepsilon \end{align} where $X$ are some controls, and $Z_1$ and $Z_2$ are two sets of dummy ...
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80 views

Multiple mediation model suitable?

Objective To test which base of power performs best in the adaptation process [of something] in a buyer-supplier relationship To understand that, I shall give a quick explanation about what bases ...
2
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246 views

Power analysis for moderator effect and mediation analysis

I want to do an a priori analysis of minimum sample size with G*Power and I have two questions about this: First, I will test an interaction effect for a moderator variable. I am not sure which ...
4
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1answer
95 views

How to interpret basic three variable mediation model?

I have run a multiple regression to determine which factors predict the willingness to pay for members of another group. The multiple regression determined that symbolic threat (fear of a cultural ...