mediation analysis

  1. Lazar

    Repeated Measures RCT mediation help

    I have a repeated measures dataset with baseline and 12 and 24 month follow-up. I need to fit a mediation model to this data. I am unsure whether my approach (see below) makes sense. The questions I have are: 1. If the model has Poisson link function for the outcome is the traditional a*b...
  2. M

    The difference of means as a fulfilled precondition for a mediation analysis

    The preconditions for a simple mediation analysis according to Hayes (2013) are statistically significant associations between X (the independent variable) and M (the mediator) as well as associations between M and Y (the dependent variable). In the case of a dichotomous independent variable...
  3. M

    Mediation with PROCESS Macro - Dependent variables as covariates

    Hi there! I have a model with 3 IV, 2 mediators and 2 DV. With PROCESS macro in SPSS I want to test for mediation effects. PROCESS allows only one IV and one DV per analysis. Thus, I am aware when testing indirect effects for one IV, know all other IVs should be placed as covariates. However...
  4. Y

    Correcting for repeated testing with 4 mediation analyses?

    Hi guys, First time poster here, sorry if I post this at the wrong spot or something like that. For my thesis if have the following 4 hypotheses: 1. Emotion regulation (partially) mediates the relationship between cognitive behavioural therapy (CBT) and social anxiety severity. 2...
  5. B

    Regression Analysis-Moderation or Mediated Analysis

    Please excuse my lack of understanding of Regression Analysis, but would it be more appropriate to run a moderated or mediated regression analysis for the following question: "Researchers theorized that metacognition for perception may underlie the relationship between source monitoring...
  6. kiton

    Assessing mediation with lagged predictors

    Hello dear forum members! I am seeking your comments/advises on the following question related to assessing mediation effects. Following the general guidelines by Baron and Kenny (1986): 1. y(it) = a + x(it) + u --> significant impact 2. m(it) = a + x(it) + u (where m -- mediator) -->...
  7. J

    Quick Mediation Analysis Question

    Hi Everyone, I have a quick question about interpreting a mediation analysis from Hayes' PROCESS macro. After running a mediation analysis, I know that I have full mediation (from the LLCI and ULCI), but I don't know how to interpret the relationship. Does the IV cause the mediator to...
  8. S

    Question on the merits of mediation analysis Vs another analysis (described within)

    Hello, I have a dataset involving an intervention (placebo versus real) - denoted as X, an outcome (Y), and a physiological variable (M) that I hypothesised would mediate the effect of X on Y. I have shown that X did not significantly affect Y (as assessed using simple linear regression), but...
  9. J

    Interpreting Mediation Output - Reporting non-existence of effect (Hayes PROCESS)

    Screenshot of Output attached! Hey all, I am new to this forum and wanted to ask for some help with regards to interpreting a mediation output, which I ran in SPSS using Hayes PROCESS macro. I am aware that the effect below suggests that there is no mediation because the indirect...
  10. T

    Mediaton Analysis

    Hey people, I am trying to find an appropriate mediation analysis method. I want to investigate how an INTERACTION of two variables mediates the association of two different variables. I have read about mediation analysis with one or multiple mediators, but nothing about an interaction as the...
  11. T

    Mediation analysis for two correlated mediators

    Hey people, I am trying to find an appropriate mediation analysis method. I want to investigate how an INTERACTION of two variables mediates the association of two different variables. I have read about mediation analysis with one or multiple mediators, but nothing about an interaction as the...
  12. R

    Multiple mediation test with two waves of mediation

    Hi. I am trying to figure out how to test for mediation in this more complex model. The fact that I am new to mediation does not make it any easier. However, I would very much like to know, how you would approach a model like the one attached? All the variables are measured on a 7-point...
  13. R

    How to do Mediation across pre-post timepoints?

    Hi all, I am looking into analyzing potential mediation and not sure how to approach it with two timepoints. For some context, participants are measured at two timepoints: pretreatment (T1) and posttreatment (T2). All participants receive the same treatment. At pre and post, they complete...
  14. M

    Variance of parts equal to variance of whole?

    Good morning, I ran a hierarchical regression to test if variables A and B (established in the literature) are mediated by variable C (my research question) when predicting overall performance in a university unit. Block 1 was variables A and B using enter method. Block 2 included variable C...
  15. L

    Mediation, Bootstrapping and Sample Size

    I'm new to statistics overall, and even newer to mediation but I'm attempting to analyze data using Process for SPSS. Before anything else, do I need a specific minimum sample size and how do I determine this? Does bootstrapping take care of this, and then, how many bootstrapping samples do I...
  16. K

    Mediate macro output categorical IV

    Hi, I've come across similar threats but none have been answered unfortunately. For my bachelor thesis I have performed a regression analysis having coded my categorical IV into two dummies. Mediator and DV are both continuous. Only one of my IV conditions relates significantly to my...
  17. K

    Sobel test categorical IV (3 categories)

    Hi, I've come across similar threats but none have been answered unfortunately. For my bachelor thesis I have performed a regression analysis having coded my categorical IV into two dummies. Mediator and DV are both continuous. Only one of my IV conditions relates significantly to my mediator...
  18. D

    Mediator variable feedbacks to IV

    Hi. I am trying to create a mediation model for: X1=employee capability; X2 (Mediator)=Company (pooled) capability; Y= employee earnings Although, I am not sure if I can still call it a mediation model when I believe and support that X1 and X2 have reciprocal relation. Where, employee...
  19. B

    ANOVA and mediation- could someone CHECK over this with me? Help gratefully received

    Hi, I really hope someone could help me out. I'm having a crisis of confidence. I have a PhD in psychology but it's been a while since I did "proper" stats analysis. I would be super grateful if someone could have a look over a completed ANOVA and mediation analysis (simple mediation -...
  20. J

    Using skewed data in a regression

    Hi, I was wondering if anyone could help me. I am conducting a mediation analysis with regression and one of the variables in negatively skewed the z score is -3.078, so the skew is significant. I have tried transforming the variables, however as you have to do all the variables and with the...