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

Estimation of the value of *α* via the alfa profile log-likelihood.

1 | ```
alfa.profile(x, a = seq(-1, 1, by = 0.01))
``` |

`x` |
A matrix with the compositional data. Zero values are not allowed. |

`a` |
A grid of values of |

For every value of *α* the normal likelihood (see the refernece) is computed. At the end, the plot of the values is constructed.

A list including:

`res` |
The chosen value of |

`ci` |
An asympotic 95% confidence interval computed from the log-likelihood ratio test. |

Michail Tsagris

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

Tsagris M.T., Preston S. and Wood A.T.A. (2011). A data-based power transformation for compositional data. In Proceedings of the 4th Compositional Data Analysis Workshop, Girona, Spain.

1 2 3 4 | ```
x <- as.matrix(iris[, 1:4])
x <- x / rowSums(x)
alfa.tune(x)
alfa.profile(x)
``` |

Compositional documentation built on June 4, 2018, 5:04 p.m.

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