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Confidence limits for the indirect effect: Distribution of the product and resampling methods
 Multivariate Behavioral Research
, 2004
"... The most commonly used method to test an indirect effect is to divide the estimate of the indirect effect by its standard error and compare the resulting z statistic with a critical value from the standard normal distribution. Confidence limits for the indirect effect are also typically based on cri ..."
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Cited by 250 (3 self)
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The most commonly used method to test an indirect effect is to divide the estimate of the indirect effect by its standard error and compare the resulting z statistic with a critical value from the standard normal distribution. Confidence limits for the indirect effect are also typically based on critical values from the standard normal distribution. This article uses a simulation study to demonstrate that confidence limits are imbalanced because the distribution of the indirect effect is normal only in special cases. Two alternatives for improving the performance of confidence limits for the indirect effect are evaluated: (a) a method based on the distribution of the product of two normal random variables, and (b) resampling methods. In Study 1, confidence limits based on the distribution of the product are more accurate than methods based on an assumed normal distribution but confidence limits are still imbalanced. Study 2 demonstrates that more accurate confidence limits are obtained using resampling methods, with the biascorrected bootstrap the best method overall. An indirect effect implies a causal hypothesis whereby an independent variable causes a mediating variable which, in turn, causes a dependent
When moderation is mediated and mediation is moderated
 Journal of Personality and Social Psychology
, 2005
"... Procedures for examining whether treatment effects on an outcome are mediated and/or moderated have been well developed and are routinely applied. The mediation question focuses on the intervening mechanism that produces the treatment effect. The moderation question focuses on factors that affect th ..."
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Cited by 217 (3 self)
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Procedures for examining whether treatment effects on an outcome are mediated and/or moderated have been well developed and are routinely applied. The mediation question focuses on the intervening mechanism that produces the treatment effect. The moderation question focuses on factors that affect the magnitude of the treatment effect. It is important to note that these two processes may be combined in informative ways, such that moderation is mediated or mediation is moderated. Although some prior literature has discussed these possibilities, their exact definitions and analytic procedures have not been completely articulated. The purpose of this article is to define precisely both mediated moderation and moderated mediation and provide analytic strategies for assessing each.
Methods for integrating moderation and mediation: A general analytical framework using moderated path analysis
, 2007
"... Studies that combine moderation and mediation are prevalent in basic and applied psychology research. Typically, these studies are framed in terms of moderated mediation or mediated moderation, both of which involve similar analytical approaches. Unfortunately, these approaches have important short ..."
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Cited by 151 (0 self)
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Studies that combine moderation and mediation are prevalent in basic and applied psychology research. Typically, these studies are framed in terms of moderated mediation or mediated moderation, both of which involve similar analytical approaches. Unfortunately, these approaches have important shortcomings that conceal the nature of the moderated and the mediated effects under investigation. This article presents a general analytical framework for combining moderation and mediation that integrates moderated regression analysis and path analysis. This framework clarifies how moderator variables influence the paths that constitute the direct, indirect, and total effects of mediated models. The authors empirically illustrate this framework and give stepbystep instructions for estimation and interpretation. They summarize the advantages of their framework over current approaches, explain how it subsumes moderated mediation and mediated moderation, and describe how it can accommodate additional moderator and mediator variables, curvilinear relationships, and structural equation models with latent variables.
Existing knowledge, knowledge creation capability, and the rate of new product introduction in hightechnology firms
 Academy of Management Journal
, 2005
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Conceptualizing and testing random indirect effects and moderated mediation in multilevel models: new procedures and recommendations
 Psychological Methods
, 2006
"... The authors propose new procedures for evaluating direct, indirect, and total effects in multilevel models when all relevant variables are measured at Level 1 and all effects are random. Formulas are provided for the mean and variance of the indirect and total effects and for the sampling variances ..."
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Cited by 68 (3 self)
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The authors propose new procedures for evaluating direct, indirect, and total effects in multilevel models when all relevant variables are measured at Level 1 and all effects are random. Formulas are provided for the mean and variance of the indirect and total effects and for the sampling variances of the average indirect and total effects. Simulations show that the estimates are unbiased under most conditions. Confidence intervals based on a normal approximation or a simulated sampling distribution perform well when the random effects are normally distributed but less so when they are nonnormally distributed. These methods are further developed to address hypotheses of moderated mediation in the multilevel context. An example demonstrates the feasibility and usefulness of the proposed methods.
Causal inference in statistics: An Overview
, 2009
"... This review presents empirical researcherswith recent advances in causal inference, and stresses the paradigmatic shifts that must be undertaken in moving from traditional statistical analysis to causal analysis of multivariate data. Special emphasis is placed on the assumptions that underly all ca ..."
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Cited by 61 (12 self)
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This review presents empirical researcherswith recent advances in causal inference, and stresses the paradigmatic shifts that must be undertaken in moving from traditional statistical analysis to causal analysis of multivariate data. Special emphasis is placed on the assumptions that underly all causal inferences, the languages used in formulating those assumptions, the conditional nature of all causal and counterfactual claims, and the methods that have been developed for the assessment of such claims. These advances are illustrated using a general theory of causation based on the Structural Causal Model (SCM) described in Pearl (2000a), which subsumes and unifies other approaches to causation, and provides a coherent mathematical foundation for the analysis of causes and counterfactuals. In particular, the paper surveys the development of mathematical tools for inferring (from a combination of data and assumptions) answers to three types of causal queries: (1) queries about the effects of potential interventions, (also called “causal effects ” or “policy evaluation”) (2) queries about probabilities of counterfactuals, (including assessment of “regret, ” “attribution” or “causes of effects”) and (3) queries about direct and indirect effects (also known as “mediation”). Finally, the paper defines the formal and conceptual relationships between the structural and potentialoutcome frameworks and presents tools for a symbiotic analysis that uses the strong features of both.
Attachment, social competencies, social support and interpersonal process in psychotherapy
 Psychotherapy Research
, 2000
"... In this survey study of 430 undergraduates, elements of the social competencies and interpersonal processes model (B. Mallinckrodt, 2000) were tested. Two social competencies were hypothesized to mediate the direct effects of 2 independent variables, attachment anxiety and avoidance, on 2 outcomes, ..."
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Cited by 54 (8 self)
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In this survey study of 430 undergraduates, elements of the social competencies and interpersonal processes model (B. Mallinckrodt, 2000) were tested. Two social competencies were hypothesized to mediate the direct effects of 2 independent variables, attachment anxiety and avoidance, on 2 outcomes, psychological distress and perceived social support. Social selfefficacy was expected to be a significant mediator only for attachment anxiety. Emotional awareness, construed as low levels of alexithymia, was expected to be a significant mediator only for attachment avoidance. A bootstrap method was used to estimate the significance of indirect effects. Structural equation analyses suggested that, instead of specialized significant parings of one mediator with one independent variable, both social selfefficacy and emotional awareness served as significant mediators for both attachment anxiety and attachment avoidance.
Yes, But What’s the Mechanism? (Don’t Expect an Easy Answer)
"... Psychologists increasingly recommend experimental analysis of mediation. This is a step in the right direction because mediation analyses based on nonexperimental data are likely to be biased and because experiments, in principle, provide a sound basis for causal inference. But even experiments cann ..."
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Cited by 52 (0 self)
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Psychologists increasingly recommend experimental analysis of mediation. This is a step in the right direction because mediation analyses based on nonexperimental data are likely to be biased and because experiments, in principle, provide a sound basis for causal inference. But even experiments cannot overcome certain threats to inference that arise chiefly or exclusively in the context of mediation analysis—threats that have received little attention in psychology. The authors describe 3 of these threats and suggest ways to improve the exposition and design of mediation tests. Their conclusion is that inference about mediators is far more difficult than previous research suggests and is best tackled by an experimental research program that is specifically designed to address the challenges of mediation analysis.
Two replicable suppressor situations in personality research
 Multivariate Behavioral Research
, 2004
"... Suppressor situations occur when the addition of a new predictor improves the validity of a predictor variable already in the equation. A common allegation is that suppressor effects rarely replicate and have little substantive import. We present substantive examples from two established research do ..."
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Cited by 51 (6 self)
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Suppressor situations occur when the addition of a new predictor improves the validity of a predictor variable already in the equation. A common allegation is that suppressor effects rarely replicate and have little substantive import. We present substantive examples from two established research domains to counter this skepticism. In the first domain, we show how measures of guilt and shame act consistently as mutual suppressors: Adding shame into a regression equation increases the negative association between guilt and aggression, whereas adding guilt increases the positive association between shame and aggression. In the second domain, we show how the effects of selfesteem and narcissism operate consistently as mutual suppressors: That is, adding narcissism into a regression equation increases the negative association between selfesteem and antisocial behavior, whereas adding selfesteem increases the positive association between narcissism and antisocial behavior. Discussion addresses the different implications for suppressors in theoretical and variable selection applications.
Empowering leadership in management teams: Effects on knowledge sharing, efficacy and performance
 Academy of Management Journal
, 2006
"... We surveyed management teams in 102 hotel properties in the United States to examine the intervening roles of knowledge sharing and team efficacy in the relationship between empowering leadership and team performance. Team performance was measured through a timelagged marketbased source. Results ..."
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Cited by 48 (0 self)
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We surveyed management teams in 102 hotel properties in the United States to examine the intervening roles of knowledge sharing and team efficacy in the relationship between empowering leadership and team performance. Team performance was measured through a timelagged marketbased source. Results showed that empowering leadership was positively related to both knowledge sharing and team efficacy, which, in turn, were both positively related to performance. Considerable research has highlighted the importance of leader behaviors for team performance