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.

learn more… | top users | synonyms

2
votes
2answers
69 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. ...
2
votes
1answer
53 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 ...
0
votes
1answer
20 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.) ...
0
votes
0answers
14 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 ...
3
votes
1answer
144 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 ...
0
votes
0answers
9 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 ...
0
votes
0answers
40 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 ...
2
votes
1answer
84 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() ...
0
votes
1answer
31 views

mediation analysis when mediator is categorical (SPSS)

I want to do a mediation analysis, with the following variables: ...
0
votes
0answers
19 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.
2
votes
2answers
68 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 ...
2
votes
0answers
26 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 ...
0
votes
0answers
21 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 ...
0
votes
0answers
26 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         ...
0
votes
0answers
23 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 ...
2
votes
0answers
35 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 ...
1
vote
1answer
48 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 ...
0
votes
0answers
15 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 ...
0
votes
0answers
27 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 ...
0
votes
0answers
41 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 ...
2
votes
1answer
138 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 ...
3
votes
1answer
82 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 ...
0
votes
0answers
31 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 ...
1
vote
1answer
61 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' ...
4
votes
2answers
154 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 ...
2
votes
1answer
51 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 ...
0
votes
0answers
119 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 ...
2
votes
0answers
15 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
votes
1answer
86 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 ...
4
votes
1answer
103 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 ...
2
votes
0answers
208 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 ...
0
votes
0answers
38 views

R: Mediation analysis with outcome as factor

I am not sure how to do a mediation analysis with my outcome as a factor while mediating and causal variables are continuous. I have tried using the "mediation" package in R for this mediation ...
2
votes
1answer
110 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 ...
0
votes
0answers
155 views

Mediation using PROCESS interpretation help please

I am using PROCESS to run mediation analysis. I have run 39 mediation analyses (13 x three different mediators). The results I have extracted show 6 different combinations either significant or ...
0
votes
0answers
131 views

How to write up regression equation with mediated relationships?

If tests (Baron & Kenny, Sobel, Bootstrapping) show that there is full and partial mediation for several relationships how do I write this down in a regression equation? (Y= beta 1 + beta 2 + beta ...
2
votes
0answers
77 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
votes
0answers
175 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 ...
0
votes
0answers
26 views

Mediation analysis using PROCESS

I need to perform mediation analysis for continuous DV&IV. I use 2 x 2 design. Can you please tell me where I can download PROCESS plug-in? And what steps to follow to conduct this analysis? I ...
4
votes
1answer
84 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 ...
5
votes
2answers
179 views

Logistic Regression/Naive Bayes with highly correlated data

Background: We work with data from sports event, more accurately with data about the spectators of sports events: how many people are being violent, what kind of event is this, etc. We have quite a ...
1
vote
1answer
217 views

An explanation/definition of negative mediation

This is a more conceptual question, rather than mathematical per se, so I will talk through an example. To test the proportion of an effect (outcome ~ exposure) mediated by a variable I have ...
0
votes
1answer
876 views

How can I test Control variables within a mediation analysis?

In my Masters thesis I do a mediation analysis with Multiple Regression Analysis. So I make use of the Baron & Kenny method for testing mediation. I also want to control for some variables. For ...
1
vote
1answer
410 views

Mediation analysis interpretation

I am carrying out a mediation analysis using PROCESS in spss. According to Field a mediation effect occurs if the confidence intervals for the indirect effect do not include 0 - this is the case but ...
4
votes
1answer
118 views

Alternatives to the Baron-Kenny approach to modeling mediation

I'm about to open the door to a very thorny issue in the social sciences. How does one correctly model and test hypotheses about mediating variables using observational data? I'm familiar with the ...
0
votes
0answers
246 views

How to test a mediation model in panel data?

I have a research design with a mediation effect between 3 variables over a period of 5 years (panel data). And I would appreciate it if you can provide advice for analysis. the independent variable ...
1
vote
0answers
118 views

Quantify mediation effect of one variable on interaction of 3 others

I would like some quantitative measure of the degree to which an observed categorical variable predicts mediates the effect of an experimentally controlled factor on a continuous DV. The situation is ...
5
votes
0answers
197 views

What does correlation between two beta coefficients mean?

I am now trying to use PRODCLIN to do the mediation analysis to obtain a confidence interval for binary single mediation analysis. http://ripl.faculty.asu.edu/downloadable-programs/prodclin/ All of ...
1
vote
0answers
225 views

Very high correlation between two variables in SEM as compared to SPSS

I am testing a model which involves three variables. I am testing a partial mediation model. In SPSS, when I calculate bivariate correlation among these three variables, the maximum correlation (say ...
7
votes
2answers
460 views

How to test for mediation when working with binary data?

I want to assess if a single variable is mediating the effects of a set of IVs on a single DV. All variables in the model (IV, DV and the mediator variable) are dichotomous (0, 1) and observed. What ...
3
votes
0answers
170 views

Testing for mediation using LMER and a Freedman and Schatzkin's method (in R)

I'm trying to analyse, whether the effect of answer correctness ($X$, binary) on confidence ratings ($Y$, continuous) in some psychological task is mediated by another rating ($M$, continuous). In ...