CKD                     CKD
DISR                    Distributed iterated score regression
HCV                     HCV
ISR                     Iterated score regression
MMLPCA                  Modified maximum likelihood principal component
                        analysis
MNIPALS                 Modified nonlinear iterative partial least
                        squares method
MRPCA                   Modified regularized PCA
PM2.5                   PM2.5
SR                      Score regression
mean                    Caculate the estimator on the mean method
orange                  orange
ozone                   ozone
review                  review
