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