Initial import of fluctuate, one of the many packages provided by

Initial import of fluctuate, one of the many packages provided by
brook at biology dot nmsu dot edu and his team at NMSU.

FLUCTUATE fits the model which has a single population which has been
growing (or shrinking) according to an exponential growth law. It
estimates 4Nu and g, where N is the effective population size, u is
the neutral mutation rate per site, and g is the growth rate of the
population.