| Riassunto: | Statistical linear regression (LR) is a tool used in developing mathematical models for applications in business (Maturo & Hoskova- mayerova, 2017), economics forecasting (Chudik, Kapetanios, & Hashem, 2018), natural sciences (Kilmer & Rodriguez, 2016), engineering (Braun, Altan, & Beck, 2014), and so on. The most common statistical method used to estimate the parameters is the least-squares regression, which works by finding the “best curve” through the data that minimizes the residual sum of squares. It has some advantages, among them, simplicity and ease of use (Raposo, 2016; Bettis & Fairlie, 2001), however atypical data and the relationship of the variables with others of them can be very problematic in regression analysis.
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