2. Linear Regression
In This Chapter:
When two variables are related to one another, they are said to be correlated. Weight and height are correlated: Taller people tend to weigh more. Personal income and tax liabilities are correlated: People who make more money tend to pay more income taxes. Unit price and units sold are correlated: Other things being equal, the more that a product costs, the fewer units that you tend to sell.
Correlation and Regression
There are some important points hidden in the prior paragraph. One of them is the word tend. Most interesting pairs of variables do not move together in lockstep. ...