JSM 2004 - Toronto

Abstract #301184

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Activity Number: 83
Type: Contributed
Date/Time: Monday, August 9, 2004 : 8:30 AM to 10:20 AM
Sponsor: Section on Health Policy Statistics
Abstract - #301184
Title: Single Level Mediation: Estimation and Sampling Distribution of the Mediated Effect when X is Dichotomous and Y are Continuous
Author(s): Oumar S. Sy*+
Companies: Kansas State University
Address: 1603 Denison Ave. # 23, Manhattan, KS, 66502,
Keywords: mediation ; estimation
Abstract:

Researchers commonly ask whether relationships between predictors X, and outcomes Y, are mediated by a third set of variables, M. Although the evaluation of the effect of X on Y that is mediated by M has been the focus of much research in social science, formal significance tests of the mediated effect are rarely conducted. The purpose of this article is to develop statistical procedures that provide point estimate, standard error estimate, and exact sampling distribution of the mediated effect when X is dichotomous and Y and M are both assumed to be continuous. This is an extremely common case since in applied research in the social and behavioral sciences where prevention programs (X) have only two components: control (X=0) and intervention (X=1).

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