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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Understanding my serial mediation from R and creating a serial mediation model

I am having trouble understanding my serial mediation results from R. I think that my results are significant, but I'm not sure how to create a model using my results. Can R create the model on its ...
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26 views

Using and Interpreting Moderated Mediation with PROCESS Macro

I'm trying to look at a moderated mediation analysis using the PROCESS macro in SPSS, but there are several ways I could do this and I'm not sure what would be best or how to interpret the results. ...
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mediation hypotheses

I am examining a loyalty program's (LP) effectiveness on customer loyalty across members and non-members. I first hypothesised members will perceive higher levels of switching costs (SC), and exhibit ...
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9 views

Mediation analysis output in r

My question relates to the mediate function summary output in the mediation package: how does the function distinguish between ADE treated and ADE control? I thought the direct effects will only occur ...
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11 views

Mediation help!

Can I use culture(categorical, 3 levels) as mediator? IV=Life satisfaction (continuous), DV=Attitudes to women(continuous)? Suspect not because AtW does not predict culture? Also if I wanted to see ...
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26 views

Interpreting Sign of Mediation Analysis

I am new to mediation analysis. I am analyzing observational data, specifically, congressional races between 1980 and 2008. I am examining whether the effect of congressional partisan votes on an ...
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67 views

R - moderated mediation using the lavaan package

I am interested in determining the conditional indirect effects of X on Y at a series of values for a third variable Z. I was able to use the lavaan package to calculate some initial indirect ...
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8 views

serial mediation with count data

It seems that, when you have count data, OLS-based mediation analysis models are not the right option to use. Poisson based strategies would be better. But I dont know about any software using poisson ...
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57 views

If x2 & x3 affect x1, & x1 affects y, should x2 & x3 be included in a regression model?

Let's consider the regression $y=x_1+x_2+x_3+\varepsilon$ It is known that $x_2$ and $x_3$ affect $x_1$, but $x_2$ and $x_3$ do not affect $y$. $x_1$ can affect $y$, but only to a small extent. The ...
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23 views

Multiple mediation analysis

I have a question about multiple mediation analysis. I had originally designed a study to see if four separate variables (M1, M2, M3 and M4) mediate the relationship between an independent variable X ...
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40 views

Inconsistent mediation

I am trying to figure out how to interpret my data where I think I have inconsistent mediation (MacKinnon, Fairchild & Fritz, 2007). Before including covariates: I have a non-significant total ...
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5 views

Mediation with mediator measured at the same time as response

I have four variables, Var1T1, Var2T1, Var1T2, and Var2T2. The two "Pre" variables were measured at the same time and the two "Post" variables were measured at the same time. It is clear to me that I ...
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26 views

Can we make mediation analysis with ANOVA?

I conducted mixed ANCOVA for my research. However, I need to make a mediation analysis as well. I have no idea of converting a mixed ANCOVA with many control variables into a regression. Can't I do ...
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10 views

Regression with Mixed Factorial Design Experiment

I have a 2 x 2 mixed factorial design experiment. I already conducted ANOVA. However, I need to make a final mediation analysis. I will apply Baron and Kenny's steps. So, I need to conduct a ...
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20 views

Mediation Analysis with many exposure variables

Does it make statistical/modelling sense if I would like to have a mediation analysis with many exposure variables (e.g. X1 and X2) but one mediator (M), where my main interest is about the causal ...
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1answer
12 views

Total effects read the same in mediation analyses

I was trying to conduct a mediation analysis to assess the effects of three different mediators between the IV and the DV. However, despite the a paths, b paths and c' paths being different for all of ...
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23 views

Mediator reverses direction of causal variable. How to interpret?

I'm running a mediation in SPSS as per Baron and Kenny's guidelines (using regression). X is a dichotomous variable; M and Y are continuous. Step 1) X-->Y (r = .07, p = .03) Step 2) X-->M (r = .45, ...
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8 views

Preacher & Hayes mediation 'model summary for dv model'

I have a (probably very stupid) question. I am doing a preacher & hayes mediation analysis on my data, but was wondering what the values for 'model summary for dv model' mean. I tried google but ...
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66 views

Power analysis for regression with multiple mediators using bootstrapping (PROCESS)

I am currently trying to help a friend of mine with some statistical analyses for her master project, and she has come up with this question, which might be of interest to others (wel'll see) and to ...
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34 views

Interpret nonsignificant mediation linear regression analysis

Undergraduate psychology student here with a probably easy question. I tested a mediation hypothesis with SPSS using linear regression. I did not find this hypothesized mediation, but I still have ...
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42 views

How can I test possible reasons for the relationship between income and handedness?

For a project, I am trying to determine what accounts for the difference in income between left handed people and right handed people. (For example, whether it is only among males, or only in a ...
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26 views

Interpretation of Bootstrapping's Result

i am currently doing my final thesis and in need for help. I am using Bootstrapping to identify the indirect relationship of celebrity endorsement (CE) to purchase intention (PI) with brand image (BI) ...
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8 views

indirect effect role in mediation

there are 4 conditions for the significance of mediation.1:significance of (X → Y),2:significance of(X → M) 3: significance of(M|X → Y) If one of these is not fulfilled,does it means insignificance ...
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what does Direct effect significance and insignificance means in mediation

There are 4 conditions for the significance of mediation: Significance of (X → Y), Significance of(X → M) Significance of(M|X → Y) , Insignificance of (X|M → Y). Does it mean partial ...
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42 views

What's the difference between including a variable as a mediator in a mediation analysis, and including a variable as a covariate in ANCOVA?

I understand that ANCOVA has a continuous outcome variable, and a categorical predictor, and (at least) one continuous covariate. Can this be run as a mediation model instead, and if so what are the ...
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26 views

Intepreting p values from R mediate() output

In the output below, the ACME p value shows that it is significant. But the p-value for Prop. Mediated Average is >10%. I thought Prop. Mediate is the proportion of the total effect mediated by the ...
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29 views

Why is path b mediation model insignificant? What does this mean?

Path b (mediator --> outcome variable) is not significant in my mediation model when I ran a regression even though the relationship between the mediator and outcome variable were significant in basic ...
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13 views

mediation or moderation

I've found the following: With increasing age, Variable X decreases. With increasing age, Variable Y increases. The X-Y correlation is negative. In my initial analysis, Y "explained" the negative ...
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21 views

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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39 views

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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40 views

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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86 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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43 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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36 views

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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192 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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28 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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14 views

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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32 views

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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64 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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1answer
61 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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170 views

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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221 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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151 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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39 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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41 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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26 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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61 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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40 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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57 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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68 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 ...