| base | The R Base Package |
| ctest | Defunct Package for Classical Tests |
| eda | Defunct Package for Exploratory Data Analysis |
| graphics | The R Graphics Package |
| grid | The Grid Graphics Package |
| lqs | Resistant Regression and Covariance Estimation |
| methods | Formal Methods and Classes |
| mle | Defunct package for maximum likelihood estimation |
| modreg | Defunct Package for Modern Regression: Smoothing and Local Methods |
| mva | Defunct Package for Classical Multivariate Analysis |
| nls | Defunct Package for Nonlinear Regression |
| splines | Regression Spline Functions and Classes |
| stats | The R Stats Package |
| stats4 | Statistical functions using S4 classes |
| stepfun | Defunct Package for Step Functions, incl. Empirical Distributions |
| tcltk | Tcl/Tk Interface |
| tools | Tools for Package Development |
| ts | Defunct Package of Time Series Functions |
| utils | The R Utils Package |