Epprecht, Eugenio K.; Aparisi, Francisco; Ruiz, Omar; … - In: International Journal of Production Economics 144 (2013) 1, pp. 90-104
In some real situations there is the need of controlling p variables of a multivariate process, where p1 out of these p variables are easy and inexpensive to monitor, while the p2=p–p1 remaining variables are difficult and/or expensive to measure. However, this set of p2 variables is important...