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Required Sample Size to Detect the Mediated Effect

Psychological science, 2007-03, Vol.18 (3), p.233-239 [Peer Reviewed Journal]

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Title:
Required Sample Size to Detect the Mediated Effect
Author: Fritz, Matthew S. ; MacKinnon, David P.
Subjects: Causality ; Clinical psychology ; Coefficients ; Computer software ; Confidence interval ; Confidence limits ; Grants ; Humans ; Mathematical independent variables ; Mediation ; Methodology ; Models, Statistical ; Parameters ; Power ; Psychology, Experimental - statistics & numerical data ; Research methodology ; Research methods ; Researchers ; Sample Size ; Samples ; Social psychology ; Social research ; Social sciences ; Standard error
Is Part Of: Psychological science, 2007-03, Vol.18 (3), p.233-239
Description: Mediation models are widely used, and there are many tests of the mediated effect. One of the most common questions that researchers have when planning mediation studies is, "How many subjects do I need to achieve adequate power when testing for mediation?" This article presents the necessary sample sizes for six of the most common and the most recommended tests of mediation for various combinations of parameters, to provide a guide for researchers when designing studies or applying for grants.
Publisher: Los Angeles, CA: Blackwell Publishing
Language: English
Identifier: ISSN: 0956-7976
EISSN: 1467-9280
DOI: 10.1111/j.1467-9280.2007.01882.x
PMID: 17444920
Source: MEDLINE
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