Additional options for the MM algorithm to compute EN S- and M-estimates.

mm_algorithm_options(
max_it = 500,
tightening = c("adaptive", "exponential", "none"),
tightening_steps = 2,
en_algorithm_opts
)

## Arguments

max_it |
maximum number of iterations. |

tightening |
how to make inner iterations more precise as the algorithm approaches a local minimum. |

tightening_steps |
for *adaptive* tightening strategy, how often to tighten until the desired tolerance
is attained. |

en_algorithm_opts |
options for the inner LS-EN algorithm. See en_algorithm_options for details. |

## Value

options for the MM algorithm.