Preview: Linear regression is another important concept for any researcher. Whether you are studying the relationship between sun exposure and skin cancer or the link between excess fat consumption and obesity, the concept of linear regression plays a big role. Linear regression is the approach used to explore a linear relationship between a dependent numerical variable y and one or more independent numerical variables x. The correlation between numerical values is an integral part of the linear regression approach. In some cases the correlation may be intuitive—it seems reasonable, for example, that students who had a high GPA in high school would go on to have a high GPA in college—but, as always, a thorough testing ...
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