Moderator Analysis

“A moderator analysis is used to determine whether the relationship between two variables depends on (is moderated by) the value of a third variable. This relationship is commonly between: (a) a continuous dependent variable and continuous independent variable, which is modified by a dichotomous moderator variable; (b) a continuous dependent variable and continuous independent variable, which is modified by a polytomous moderator variable; or (c) a continuous dependent variable and continuous independent variable, which is modified by a continuous moderator variable. In this guide, we focus on (a); namely, the relationship between a continuous dependent variable and continuous independent variable, which is modified by a dichotomous moderator variable.”
“For example, a moderator analysis can be used to determine whether the relationship between HDL cholesterol and amount of exercise performed per week is different for normal weight and obese participants (i.e., the continuous dependent variable is “HDL cholesterol”, the continuous independent variable is “amount of exercise performed per week” and the dichotomous moderator variable is “body composition”, consisting of two groups: “normal weight” and “obese”).”

 
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