Simple Linear Regression

Before proceeding to this article, we assume that you have already completed the previous article “Why to build machine learning model ?”

Regression is a supervised machine learning model where we will predict or find out the continuous or analog values based on past values or data.

Understand Linear Regression with a Case Study of McDolands Corporation

The McDonald’s Corporation is the leading global food service retailer with more than 30,000 local restaurants serving nearly 50 million people in more than 119 countries each day. This global presence, in addition to its consistency in food offerings and restaurant operations, makes McDonald’s a unique and attractive setting for economists to make salary and price comparisons around the world. Because the Big Mac hamburger is a standardized hamburger produced and sold in virtually every McDonald’s around the world, the Economist, a weekly newspaper focusing on international politics and business news and opinion, as early as 1986 was compiling information about Big Mac prices as an indicator of exchange rates.

Building on this idea, researchers Ashenfelter and Jurajda proposed comparing wage rates across countries and the price of a Big Mac hamburger. Shown below are Big Mac prices and net hourly wage figures (in U.S. dollars) for 27 countries. Note that net hourly wages are based on a weighted average of 12 professions.

Big Mac Price (USD)Hourly Wages (USD)
1.471.7
1.867.8
1.482.05
3.1412.3
Table-I : Big Mac Price in USD vs Houly Wages of that country in USD

Click here to download the data set.

Managerial and Statistical Questions to be Answer for any kind of regression data.

1. Is there a relationship between the price of a Big Mac and the net hourly wages of workers around the world? If so, how strong is the relationship?

2.Is it possible to develop a model to predict or determine the net hourly wage of a worker around the world by the price of a Big Mac hamburger in that country? If so, how good is the model?

3.If a model can be constructed to determine the net hourly wage of a worker around the world by the price of a Big Mac hamburger, what would be the predicted net hourly wage of a worker in a country if the price of a Big Mac hamburger was $3.00?

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