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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mediation analysis in AMOS

my values in AMOS for mediation analysis are coming significant at .001 level (p value). can someone help me with the interpretation and is this level of significance acceptable in social sciences ...
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Mediation analysis with Likert scale mediator

For my master's thesis, I need to conduct a mediation analysis. My independent variable is the condition assigned, with three different conditions: high income, low income and neutral. I coded the IV ...
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Does an underpowered mediation/moderation SEM have an increased chance of Type I error?

A study I'm familiar with has been encouraged by its review board to take more participants. This seems a sensible request on general grounds, but the reviewers suggested that it was essential to ...
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41 views

Help needed interpreting medeff results in stata

I am new to using the medeff function. I am looking for basic help in how to read the results I got from my analysis. I got the following results: 1) Because the ACME mean is insignificant, does ...
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28 views

What's an intuitive way to remember the difference between mediation and moderation?

In my experience these two terms frequently confuse students. For teaching purposes I am looking for some way to help students distinguish between them. One way might be to show that the statistical ...
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Calculation of effect size for a mediation analysis with a dichotomous DV

I am using Haye's PROCESS macro to calculate the indirect effect (mediation) using a continuous IV, continuous mediator and a dichotomous DV. Haye's macro does not calculate an effect size for ...
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80 views

Multiple Hierarchical Regression - Procedure with mediation

I have a set of hypothesis that I am looking to test. The model is as follows: http://i.imgur.com/pdGRiyw.jpg (simplified to X -> M -> Y) ie. I am looking for direct effects from X -> Y, X -> M, M ...
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19 views

Mediation correlation

I have the following scenario in my research: In an open source software setting, we want to prove that when a project includes a lot of contributors who have collaborated before, then the project is ...
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17 views

Resampling cases vs. resampling residuals bootstrap for mediation analysis

I hope this is not a duplicate question, but I couldn't find any information on this topic. I am running Sobel-Goodman mediations in Stata. For a particular model, the c' path (direct effect after ...
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Mediation using normalized variables

If I normalize (range 0-1) variables x, m, y prior to conduct a mediation (OLS), do I report them as "fully normalized coefficients". How do I interpret the results? I am used to report unstandardized ...
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Adjusting for mediating variables (everyone does it!)

I have always learned that when doing multivariable regression, one should not adjust for mediating variables between the independent and dependent variables of interest. I have seen in the academic ...
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25 views

summary measure of change over two timepoints to use as mediator in regression model

I am intending to analyze some pre- post- treatment data. My intention is to use ANCOVA to analyse treatment effects. However, in a separate analysis, I am going to test the hypothesis that the ...
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56 views

Mediation model: is it wrong?

From time to time it crosses my mind that the mediation model so widely used in psychology area of research is not a good model, because it 'works' when two variables are correlated. During my ...
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Is 'indirect effect' the same as 'mediation'?

Is it correct to use 'indirect effect' and 'mediation' interchangeably in all situations? I mean if we know that A influences B and B influences C. Can we conclude that the effect is mediated by B ...
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136 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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65 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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25 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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28 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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23 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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50 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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29 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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35 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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50 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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129 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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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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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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112 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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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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307 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
65 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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64 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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28 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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166 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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35 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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59 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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613 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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690 views

mediation analysis when mediator is categorical (SPSS)

I want to do a mediation analysis, with the following variables: ...
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84 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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693 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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70 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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70 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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39 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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76 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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76 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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201 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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1answer
417 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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137 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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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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272 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
158 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 ...