Autocorrelation function (forced to be decreasing by isotonic regression).

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`x` |
numeric vector. |

`lagmax` |
numeric. The maximal lag of the autocorrelations. |

`weave1` |
logical. If set to |

`isoacf`

computes the autocorrelation function (ACF)
of `x`

enforcing the ACF to be decreasing by isotonic regression.
See also Robertson et al. (1988).

`isoacf`

returns a numeric vector containing the ACF.

Lumley T & Heagerty P (1999),
Weighted Empirical Adaptive Variance Estimators for Correlated Data Regression.
*Journal of the Royal Statistical Society B*, **61**,
459–477.

Robertson T, Wright FT, Dykstra RL (1988),
*Order Restricted Statistical Inference*.
New York. Wiley.

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