For isotonization problems some increase in speed and decrease in complexity can be achieved through the use of the pool monotone groups algorithm of Y.L. Zhang and M.A. Newton (1997). It isotonizes a weighted and ordered set of values. This function is borrowed from package `Icens`

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`est` |
The vector of values, in the appropriate order. |

`ww` |
The weight vector. |

To be supplied at some later date.

An Object containing the following components:

`est` |
The isotonized estimates. |

`ww` |
The weight associated with the isotonized estimates. |

`poolnum` |
The number of values pooled in the current estimate. |

`passes` |
The number of passes which were required to isotonize the list. |

It is used in `ModifiedEMICMmac`

and not to be called by the user.

Alain Vandal and Robert Gentleman

Y. L. Zhang and M. A. Newton (1997), http://www.stat.wisc.edu/~newton/newton.html.

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