mvn.rw(rw.var) mvn.diag.rw(rw.sd) mvn.rw.adaptive(rw.sd, rw.var, scale.start = NA, scale.cooling = 0.999, shape.start = NA, target = 0.234, max.scaling = 50)scale.start, the scale of the proposal covariance matrix will be adjusted in an effort to match the target acceptance ratio.
    The parameters scale.cooling and max.scaling adjust the scale adaptation.
    Beginning with iteration shape.start, a scaled empirical covariance matrix will be used for the proposals.
  proposal argument of pmcmc or abc.
  Given a parameter vector, each such function returns a single draw from the corresponding proposal distribution.
pmcmc, abc