Wrapper LinearRegression MMM for baseline analysis

[wd60622]

Special case MMM which no adstock and linear saturation transformation. For baseline model but allows for all of the features that MMM allows.

Wrapper around:

from pymc_marketing.mmm import AdstockTransformation, SaturationTransformation, MMM

class NoAdstock(AdstockTransformation): 
    lookup_name: str = "no_adstock"

    def transform(self, x): 
        return x

class Linear(SaturationTransformation): 
    lookup_name: str = "linear"
    
    def transform(self, x, beta): 
        return beta * x

mmm = MMM(adstock=NoAdstock(), saturation=Linear(), **kwargs)

CC: @cetagostini

[juanitorduz]

yes!