| cor.fk | Fast estimation of Kendall's tau rank correlation coefficient | 
| covPC | Covariance Matrix Estimation from princomp Object | 
| covPCAgrid | Robust Covariance Matrix Estimation | 
| covPCAproj | Robust Covariance Matrix Estimation | 
| data.Zou | Test Data Generation for Sparse PCA examples | 
| l1median | Multivariate L1 Median | 
| l1median_BFGS | Multivariate L1 Median | 
| l1median_CG | Multivariate L1 Median | 
| l1median_HoCr | Multivariate L1 Median | 
| l1median_NLM | Multivariate L1 Median | 
| l1median_NM | Multivariate L1 Median | 
| l1median_VaZh | Multivariate L1 Median | 
| objplot | Objective Function Plot for Sparse PCs | 
| opt.BIC | Model Selection for Sparse (Robust) Principal Components | 
| opt.TPO | Model Selection for Sparse (Robust) Principal Components | 
| PCAgrid | (Sparse) Robust Principal Components using the Grid search algorithm | 
| PCAproj | Robust Principal Components using the algorithm of Croux and Ruiz-Gazen (2005) | 
| PCdiagplot | Diagnostic plot for principal components | 
| plot.opt.BIC | Tradeoff Curves for Sparse PCs | 
| plot.opt.TPO | Tradeoff Curves for Sparse PCs | 
| plotcov | Compare two Covariance Matrices in Plots | 
| qn | scale estimation using the robust Qn estimator | 
| ScaleAdv | centers and rescales data | 
| sPCAgrid | (Sparse) Robust Principal Components using the Grid search algorithm |