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moderateanalysis1

(2019-11-29 20:14:05)
标签:

调节效应

分类: 统计分析技术
https://www.researchgate.net/post/How_can_we_distinguish_between_mediator_and_moderator_variable_theoretically

12th Dec, 2014
HP Inc.
Hi Amer,
Mediator variable is the middle variable / "middleman" between an independent variable (IV) and a dependent variable (DV).  Objective of the mediator variable is to explain the relationship between IV & DV e.g. IV is not directly influencing DV but rather IV is indirectly influencing DV through mediator variable.  Pictorially, Independent variable --> Mediator variable --> Dependent variable. For example, salary (IV) is positively influencing education (mediator variable) and then education is positively influencing health-screening expenses (DV).  When the effect of education is removed, the relationship between salary and health-screening disappears.
Moderator variable is a third party variable that modify the relationship between an independent variable (IV) and a dependent variable (DV).  Objective of the moderator variable is to measure the strength of the relationship between the IV & DV.  Pictorially, moderator variable's arrow line is pointing to the mid point of the arrow-lined relationship between independent variable --> dependent variable.  For example, if age is a moderator variable between salary (IV) and health-screening expenses (DV), then relationship between salary & health-screening can be stronger for older men and less strong for younger men.
Regards,
Fung

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