12.1 Introduction to Simple Linear Regression

An introduction to simple linear regression.

The pain-empathy data is estimated from a figure given in:
Singer et al. (2004). Empathy for pain involves the affective but not sensory components of pain. Science, 303:1157–1162.

The Janka hardness-density data is found in:
Hand, D.J., Daly, F. , Lunn, A.D., McConway, K., and Ostrowski, E., editors
(1994). The Handbook of Small Data Sets. Chapman & Hall, London.

Original source: Williams, E.J. (1959). Regression Analysis. John Wiley & Sons,
New York. Page 43, Table 3.7.

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