# Statistics Functions Not Available in Spotfire Enterprise Runtime for R

The following statistics functionality is not available in TERR version 6.1. The complete listings are in the related topics.

- Certain functionality for statistical modeling, including the following.

  Statistical modeling | Functionality not available in TERR
  --- | ---
  Clustering | `plclust`, a cluster plotting function.
  Density estimation | `kernel` and related functions.
  Hypothesis testing | Some lesser-used tests.
  Time series models | `spectrum`, `spec.pgram`, and other frequency domain functions.
  Miscellaneous statistics models | `ppr`.

- The optimization function `constrOptim`.
- A few infrequently encountered statistical distribution-related functions.
- Most of the functions related to directly producing graphics.