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Statistical Application Development with R and Python - Second Edition by Prabhanjan Narayanachar Tattar

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Regression spline

In this section, we will consider various enhancements/generalizations of the linear regression model. We will begin with a piecewise linear regression model and then consider the polynomial regression extension.

The term spline refers to a thin strip of wood that can be easily bent along a curved line.

Basis functions

In the previous section, we made multiple transformations of the input variable X with Basis functions. In the Data Re-expression section of Chapter 4, Exploratory Analysis, we saw how a useful log transformation gave a better stem-and-leaf display than the original variable itself.

In many applications, it has been found that the ...

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