In a simple mediation model, the effect of a manipulated variable X on a dependent variable Y over and above the effect of the mediator Me can be estimated by regressing Y on X and Me. The impact of X on Y in such a model is adjusted for the relationship both between X and Me and between Me and Y . The authors examine the adjustment function in the context of a 2× 2 design with two manipulated ...

In primary studies, psychotherapy researchers frequently search for mediator and moderator variables that can help them understand the relationship between treatment and outcome. Yet a review of past psychotherapy meta-analyses revealed that none examined the possible role of mediator variables; and although all of them searched for moderators of study outcome, that search was generally not as ...

OBJECTIVE To present data on moderators and mediators of treatment response from the Multimodal Treatment Study of Children With ADHD (MTA). METHODS Moderator variables (baseline factors that define subgroups with greater vs lesser intervention response) and mediator variables (factors occurring during treatment that explain how interventions "work") are described with specific application to...

knowledge management is influenced by many variables such as organizational structure, leadership style, organizational culture, information technology etc. we can spot organizational structure and climate as a framework and infrastructure can be considered in implementing successful knowledge management. previous studies examined these variables in the implementation of knowledge management. i...