![]() ![]() Again, you want to isolate the effect of each variable. This process allows you to learn the role of each independent variable without worrying about the other variables in the model. Regression analysis does this by estimating the effect that changing one independent variable has on the dependent variable while holding all the other independent variables constant. To accomplish this goal, you must minimize the effect of confounding variables. We needed to isolate the role of the exercise intervention from everything else that can impact bone mineral density, which ranges from diet to other physical activity. For example, I participated in an exercise intervention study where our goal was to determine whether the intervention increased the subjects’ bone mineral density. When you perform regression analysis, you need to isolate the role of each variable. ![]() What does controlling for a variable mean? ![]()
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