TY - JOUR

T1 - An alternative framework for defining mediation

AU - Collins, Linda M.

AU - Graham, John W.

AU - Flaherty, Brian P.

N1 - Funding Information:
This research was supported by National Institute on Drug Abuse grants P50 DA 10075 and ROI DA04111. The authors are grateful to Niall Bolger and Roger Millsap for valuable comments.

PY - 1998

Y1 - 1998

N2 - The present article provides an alternative framework for evaluating mediated relationships. From this perspective, a mediated process is a chain reaction, beginning with an independent variable that affects a mediator that in turn affects an outcome. The definition of mediation offered here, presented for stage sequences, states three conditions for establishing mediation: (a) the independent variable affects the probability of the sequence no mediator to mediator to outcome; (b) the independent variable affects the probability of a transition into the mediator stage; (c) the mediator affects the probability of a transition into the outcome stage at every level of the independent variable. This definition of mediation is compared and contrasted with the well-known definition of mediation for continuous variables discussed in Baron and Kenny (1986), Judd and Kenny (1981), and Kenny, Kashy, and Bolger (1997). The definition presented in this article emphasizes the intraindividual, time-ordered nature of mediation.

AB - The present article provides an alternative framework for evaluating mediated relationships. From this perspective, a mediated process is a chain reaction, beginning with an independent variable that affects a mediator that in turn affects an outcome. The definition of mediation offered here, presented for stage sequences, states three conditions for establishing mediation: (a) the independent variable affects the probability of the sequence no mediator to mediator to outcome; (b) the independent variable affects the probability of a transition into the mediator stage; (c) the mediator affects the probability of a transition into the outcome stage at every level of the independent variable. This definition of mediation is compared and contrasted with the well-known definition of mediation for continuous variables discussed in Baron and Kenny (1986), Judd and Kenny (1981), and Kenny, Kashy, and Bolger (1997). The definition presented in this article emphasizes the intraindividual, time-ordered nature of mediation.

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U2 - 10.1207/s15327906mbr3302_5

DO - 10.1207/s15327906mbr3302_5

M3 - Article

AN - SCOPUS:0032221779

SN - 0027-3171

VL - 33

SP - 295

EP - 312

JO - Multivariate Behavioral Research

JF - Multivariate Behavioral Research

IS - 2

ER -