Regression+Wisdom

Key Concepts

 * **Extrapolation-** predicting data values farther from what is given then is wise.
 * **Outlier-** a data point that is far from the others in X or Y.
 * **Leverage-** data points that have a significant amount of influence on a linear model becasue they are outliers in X.
 * **Influential point**- An outlier which affects the slope of the linear regression line
 * **Lurking variable (confounding variable)-** A variable (which is not being texted) that influences the independant or dependant variables.
 * **Subset-** A set of numbers consisting of elements from a given set; can be of equal or smaller size