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Feature engineering is the base that will help us further to remove outliers. Here, we combine two columns, apply the formula, and get price per square feet. Then, we find the number of unique location where we get 1,304 locations. Here, some of the locations are just mentioned once or twice; therefore, we set a threshold of 10, so all the locations that appear over five times are considered Figure 2.4.

Figure 2.4 Different BHK attribute.