Adding new columns

Adding new columns that derive information from existing data or based on domain knowledge is known as Feature Engineering. Even in relatively simple datasets, there are always new characteristics you could pull out to create a more in-depth analysis.

One of the most critical skills a data scientist needs to learn is how to identify opportunities for feature engineering.

In this exercise, you will add two columns to marketing:

day_of_week: represents the day of the week as an integer (we added a new column, day that represents the day of the week and defined a dictionary that maps the day of the week to each numerical value from 0 to 6 for this purpose.)
is_correct_lang: conveys whether the ad was shown to the user in their preferred language

Add a new column, channel_code, which maps the values in the subscribing_channel column to a numeric scale using the channel_dict dictionary.

Exercise

Adding new columns

Instructions 1/2