# Tagged Questions

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### 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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### 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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### 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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### 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 ...
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### 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 ...
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### 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 ...
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### 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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### 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 ...
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### 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 ...
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### 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 ...