canlab / MediationToolbox

Single-level and multi-level mediation analyses for any kind of data, with bootstrap-based significance testing. Neuroimaging-oriented functions allow for mediation effect parametric mapping (mapping of mediation effects across the brain) and multivariate mediation.
https://canlabweb.colorado.edu/wiki/doku.php/help/mediation/m3_mediation_fmri_toolbox
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Interpretation of results #18

Open shilpitju opened 3 years ago

shilpitju commented 3 years ago

Hi,

Thanks for this wonderful tool. I used the toolbox for my project and got the following table:

Single-level model a b c' c ab
Coeff 0.13 -286.84 164.12 127.91 -36.20
STE 0.10 167.88 77.28 77.64 38.47
t (~N) 1.31 -1.71 2.12 1.65 -0.94
Z 1.27 -1.63 2.00 1.58 -0.92
p 0.2049 0.1023 0.0457 0.1137 0.3573

What particular column gives the mediation effect here, c' or ab? These Coeff and STE appear to be very high numerically, is it possible?

Thanks,

Shilpi Modi

torwager commented 3 years ago

It’s ab

And yes, totally possible

Best wishes, Tor


Tor Wager Diana L. Taylor Distinguished Professor Presidential Cluster in Neuroscience and Department of Psychological and Brain Sciences Dartmouth College


On Apr 1, 2021, at 2:14 AM, shilpitju @.***> wrote:

Hi,

Thanks for this wonderful tool. I used the toolbox for my project and got the following table:

Single-level model a b c' c ab Coeff 0.13 -286.84 164.12 127.91 -36.20 STE 0.10 167.88 77.28 77.64 38.47 t (~N) 1.31 -1.71 2.12 1.65 -0.94 Z 1.27 -1.63 2.00 1.58 -0.92 p 0.2049 0.1023 0.0457 0.1137 0.3573

What particular column gives the mediation effect here, c' or ab? These Coeff and STE appear to be very high numerically, is it possible?

Thanks,

Shilpi Modi

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shilpitju commented 3 years ago

Thanks, That means in the example above, mediator is not mediating the relation between X and Y (p=0.3573).