| CD4 | CD4 cell counts |
| FPCscoreLSE | Least square estimates of functional principal component scores |
| GenDataKL | Generate functional/longitudinal data via KL expansion |
| GetGCVbw1D | Bandwidth selection through GCV for one-dimension cases |
| GetGCVbw2D | Bandwidth selection through GCV for two-dimension cases |
| kernfun | Kernel Functions |
| KFPCA | Kendall Functional Principal Component Analysis (KFPCA) for sparse design |
| KFPCA_reg | Kendall Functional Principal Component Analysis (KFPCA) for dense and regular design |
| MeanEst | Local linear estimates of mean function |
| predict.KFPCA | Predict FPC scores |
| SparsePlot | Sparse plot |