Description Usage Arguments Details Value Author(s) References See Also Examples

MLE of the angular central Gaussian distribution.

1 | ```
acg(x, tol = 1e-07)
``` |

`x` |
A matrix with directional data, i.e. unit vectors. |

`tol` |
The tolerance value at which to terminate the iterations. |

There is a constraint on the estimated covariance matrix; its trace is equal to the number of variables. An iterative algorithm takes place and convergence is guaranteed.

A list including:

`iter` |
The number if iterations required by the algorithm to converge to the solution. |

`cova` |
The estimated covatriance matrix. |

Michail Tsagris R implementation and documentation: Michail Tsagris <[email protected]> and Giorgos Athineou <[email protected]>

Tyler D. E. (1987). Statistical analysis for the angular central Gaussian distribution on the sphere. Biometrika 74(3): 579-589.

```
rbingham, rfb, f.rbing, fb.saddle
```

1 2 3 4 5 6 7 8 |

Directional documentation built on March 19, 2018, 5:05 p.m.

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