Typo pag. 155

[OrlandiMartina]

"Statistical Science" , pag 155
Unnecessary repetition of the word "which" twice in line 63 of code.
Replace "the matrix X which ( which had been used for fitting)"
With "the matrix X ( which had been used for fitting)"

[MarcoRianiUNIPR]

I unified the previous report by with this

Thank you @OrlandiMartina and @Samuele7F