Ultimately, the author rejected the use of regression by using an eyeball test. Eyeball tests are not rigorous, and can be misleading. Further, the purpose of

Ultimately, the author rejected the use of regression by using an eyeball test. Eyeball tests are not rigorous, and can be misleading. Further, the purpose of regression is not just to obtain the slope via least squares in the case of obvious relationships, but to provide a test of the null hypothesis (slope = 0) of weaker, but theoretically interesting relationships. This type of amateur (and wrong) statistics article shouldn't be making it to the top of HN.