Below is the output of my bootstrap model (Preacher & Hayes, 2008). Path a, b and c are marginally significant (p < 0.1), but c' is not significant. I have read that when this is the case, there is reason to believe that there is complete mediation? Is that correct?
Thank you for your help!
Dependent, Independent, and Proposed Mediator Variables: DV = Relation IV = DummyRDn MEDS = Boardinv Statistical Controls: CONTROL = Numberpa Priortie Weighted Sample size: 101 IV to Mediators (a paths) coeff se t p Boardinv 1,5302 0,8953 1,7090 0,0907 Direct Effects of Mediators on DV (b paths) coeff se t p Boardinv 0,1160 0,0672 1,7255 0,0877 Total Effect of IV on DV (c path) coeff se t p DummyRDn 1,1070 0,5959 1,8577 0,0663 Direct Effect of IV on DV (c' path) coeff se t p DummyRDn 0,9295 0,5988 1,5523 0,1239 Partial Effect of Control Variables on DV coeff se t p Numberpa -0,2421 0,1090 -2,2206 0,0288 Priortie -0,2533 0,2173 -1,1656 0,2467 Weighted -0,7825 0,2688 -2,9107 0,0045 Model Summary for DV Model R-sq Adj R-sq F df1 df2 p 0,2002 0,1581 4,7547 5,0000 95,0000 0,0006 ************* BOOTSTRAP RESULTS FOR INDIRECT EFFECTS ************* Indirect Effects of IV on DV through Proposed Mediators (ab paths) Data Boot Bias SE TOTAL 0,1775 0,1796 0,0021 0,1689 Boardinv 0,1775 0,1796 0,0021 0,1689 Bias Corrected Confidence Intervals Lower Upper TOTAL -0,0197 0,7078 Boardinv -0,0197 0,7078 ****************************************************************** Level of Confidence for Confidence Intervals: 95 Number of Bootstrap Resamples: 5000 Best Answer
No, you cannot assume a complete mediation.
For a mediation you would need a significant direct relationship between the IV and the Mediator (a), as well as a significant direct relationship between the Mediator and the DV (b).
In addition, the decrease of the direct relationship between IV and DV without the Mediator (c) and with the Mediator (c') is rather small. In a complete mediation this difference should be larger and c' should be reasonably close to $0$. See this question for more information about testing for complete mediation.