Hi!. All, I am a bit confused about the difference between correlation and regression analysis. My friends has been telling me that correlation analysis is designed for understanding if relationships exist between variables, which can be either positive or negative. However, doesn't it look like the same as regression analysis? because ones can not only know if there is a relationship among variables with regression analysis, but they can also know if the relationship is directional or not. And I have noticed that many study tend to perform correlation analysis before performing regression analysis. Why bother to perform correlation analysis first, why not just perform regression?

If possible, could you give me examples of research question of correlation and regression analysis respectively?

If possible, could you give me examples of research question of correlation and regression analysis respectively?

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