βœ… Quiz M1.03

βœ… Quiz M1.03#

Question

How are categorical variables represented?

  • a) categorical feature is only represented by non-numerical data

  • b) categorical feature represents a finite number of values called categories

  • c) categorical feature can either be represented by numerical or non-numerical values

Select all answers that apply

Question

An ordinal variable:

  • a) is a categorical variable with a large number of different categories;

  • b) can be represented by integers or string labels;

  • c) is a categorical variable with a meaningful order.

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Question

One-hot encoding:

  • a) encodes each column with string-labeled values into a single integer-coded column

  • b) transforms a numerical variable into a categorical variable

  • c) creates one additional column for each possible category

  • d) transforms string-labeled variables using a numerical representation

Select all answers that apply

Question

Assume we have a dataset where each line describes a company. Which of the following columns should be considered as a meaningful numerical feature to train a machine learning model to classify companies:

  • a) the sector of activity (β€œconstruction”, β€œretail”, β€œenergy”, β€œinsurance”…)

  • b) the phone number of the sales department

  • c) the number of employees

  • d) the profits of the last quarter

  • e) the post code of the head quarters

Select all answers that apply