February 2016
Beginner to intermediate
312 pages
7h 23m
English
Content preview from Regression Analysis with Python
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Polynomial regression
As an extension of interactions, polynomial expansion systematically provides an automatic means of creating both interactions and non-linear power transformations of the original variables. Power transformations are the bends that the line can take in fitting the response. The higher the degree of power, the more bends are available to fit the curve.
For instance, if you have a simple linear regression of the form:
By a second degree transformation, called quadratic, you will get a new form:
By a third degree transformation, called ...
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