https://www.hindawi.com/journals/ijno/2015/279086/

https://blog.minitab.com/blog/adventures-in-statistics-2/regression-analysis-how-do-i-interpret-r-squared-and-assess-the-goodness-of-fit

http://www.netlib.org/linalg/html_templates/node29.html

https://www.mathworks.com/help/matlab/ref/minres.html