Engineering features for modeling
As part of the system's understanding you would have gained some insights into your problem and dataset that can be used to create new features in your dataset by combining the existing features in various ways. For example, we can create a new feature called volume by multiplying length, width, and height. Similarly, we can create a feature called mpg-ratio by dividing highway-mpg by city-mpg. Let's also create a feature called cylinder-size by dividing engine-size by cylinder-count. The equations for these features are as follows:
volume = length * width * heightmpg-ratio = highway-mpg / city-mpgcylinder-size = engine-size / cylinder-count
Figure 4.11 shows an example of what these feature values look like:
Figure 4.11 – Engineered features for the Automobile Dataset
As you can now see, many possibilities exist to create new features that could prove helpful in solving your problem...
