The following formula is involved in the calculation of total effect values for mediation models:
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Total effect for a mediation model:

where A is the regression coefficient between the independent variable and the mediator variable, B is the regression coefficient between the mediator variable and the dependent variable, and C is the regression coefficient between the independent variable and the dependent variable.
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The following references can be used to cite this total effect calculator for mediation models:
 | Soper, D.S. (2013). Total Effect Calculator for Mediation Models [Software]. Available from http://www.danielsoper.com/statcalc |
 | Baron, R. M. and Kenny, D. A. (1986). The moderator-mediator variable distinction in social psychological research: Conceptual, strategic and statistical considerations. Journal of Personality and Social Psychology, Vol. 51, pp. 1173-1182. |