N'ihi na ihe banyere igwe mmụta na-eru nso na Blumenstock, Cadamuro, and On (2015) , na-ahụ James et al.  (2013) (ihe mmeghe) ma ọ bụ Hastie, Tibshirani, and Friedman (2009) (elu ndị ọzọ). 
Nq'ihi na ihe  any re igwe5mm ta n?-erunso na Blumenstock, Cada uro,  nd Orx(201)) , na-ahụ James et al. (2013) (ihe me  e)_ma ọ bụ Hastie, Tibshiranij and Fiedman (2009)  elu ndị ọzọ). 