For example I have the following data structure:
user: Chris age: 32 income: 60.000 basket value: 45
I want predict the basket value, and my features are the age and income.
With a linear regression I get a regression function as the result of the fitting for example: $$y = 0.5x + 0.785$$
Now I can use the function for prediction.
What is the form of the result of the fitting by regression decision tree? Is it also a function?