Mediation in bivariate relationships implies that a third variable relates to both original variables, often more strongly than they relate to each other. In causal relationships, the mediator causes changes in the outcome, and the original cause affects the mediator. Sometimes the original cause ...

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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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16 views

mediation analysis with binary mediator

I want to assess if a binary variable is mediating the effect of a continuous IV on a single DV. The DV is a truncated variable that starts from 0. ...
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1answer
16 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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11 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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21 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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25 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
73 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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1answer
69 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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20 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
54 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
117 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
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1answer
27 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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67 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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8 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 ...
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1answer
71 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
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1answer
79 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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0answers
153 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 ...
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0answers
33 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
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1answer
99 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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73 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 ...
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119 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 ...
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70 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 ...
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0answers
142 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 ...
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0answers
17 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 ...
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1answer
74 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 ...
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2answers
140 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 ...
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1answer
139 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 ...
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1answer
592 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 ...
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1answer
306 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 ...
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1answer
97 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 ...
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45 views

(Conceptual framework) Should confounding factors be placed in the framework?

Suppose we study the effect of a factor X on an outcome Y. We hypothesize that there may be a potential confounder Z, which may or may not be observable or present in the data. Controlling for Z is ...
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195 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 ...
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101 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
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178 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 ...
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207 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 ...
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2answers
344 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
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142 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 ...
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209 views

Good CFA fit indices, but poor fit indices at structural equation modeling

I am currently working on my research and I have the following problem. I have conducted a CFA on all model variables and after deleting the troublesome items, the CFA yielded good fit indices. ...
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1answer
268 views

Performing a Sobel test with huge discrepancies between unstandardized coefficients?

I have read pretty much everything I can find on performing a Sobel test on the internet however the huge discrepancy in my unstandardized coefficients makes me feel like I am doing something ...
2
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0answers
84 views

Mediation analysis using binary IV and difference scores

I have one IV ($A$) and two DVs ($B$,$C$). $A$ is a binary, experimentally manipulated variable. Each subject has two scores on $B$ and two scores on $C$, corresponding to the experimental ...
3
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2answers
155 views

Must there be “an effect to be mediated” in mediational analysis (i.e., must IVs & DVs be correlated)?

Baron and Kenny outlined several steps to aid in determining if a mediational analysis is appropriate to test a particular hypothesis. The very first step was "Show that the initial [independent] ...
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2answers
404 views

Dummy coding categorical variables regression/+mediation

I have more than one question, if you can help: I have a regression model with 5 control variables each with 5 categories. I am wondering if there's any way, that can be also considered ...
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2answers
2k views

How to explain significant correlation between independent and dependent variable but non significant regression test in the presence of mediation? [duplicate]

Possible Duplicate: Not-significant F but a significant coefficient in multiple linear regression In my research, I use Optimism as the IV, Job Satisfaction as the DV and Work-Family ...
2
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1answer
630 views

Mediation with no significant mediators?

I have a research design with 3 predictors and 2 mediators, tested on 2 different samples with multiple regression analysis. For my first sample (N=70) the results were:variables(mediators) entered at ...
2
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0answers
249 views

Effect of mediating variable independent of effect of possible covariate

Here is a rather involved question. It can be summed up as follows: how can I test the effect of a potential mediating variable, independent of the effect of a possible covariate with which it is ...
4
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1answer
2k views

Mediator versus moderators - not sure which is more appropriate

I am undertaking a study which has the following aims: The main aim of the current study is to investigate the effects of food messages about the healthiness of foods on actual food intake. ...
4
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2answers
4k views

How do you establish complete versus partial mediation in a simple mediational model?

I recently received this question from a student: In a simple mediation model, if I have found the indirect effect (ab) to be significant and the direct effect (c') to be small and ...
4
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1answer
457 views

Multiple mediation analysis in R

I am wondering if anyone knows of a way to run a multiple mediation model in R. I know the mediation package allows for multiple simple mediation models, but I want to run one model that evaluates ...
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0answers
169 views

Dealing with nuisance variables in a MANOVA situation

I have a study in which participants facebook profiles were rated by a group of students. The participants were then randomly allocated into one of three groups: the uncertain condition (where they ...
4
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2answers
238 views

Mediation analysis with curvilinear mediator and categorical predictors

I am currently conducting analyses where I wish to investigate how one variable (M) mediates the association between SES (3-level categorical variable) and a measure of health (continuous variable). ...