R/DAISIE_IC.R

In DAISIE: Dynamical Assembly of Islands by Speciation, Immigration and Extinction

#' Calculates information criterion from DAISIE ML estimates?
#'
#' @inheritParams default_params_doc
#'
#' @return List of two numerics with WIC and AICb
#' @export
#'
DAISIE_IC <- function(datalist,
                      initparsopt,
                      idparsopt,
                      parsfix,
                      idparsfix,
                      endmc = 1000,
                      res = 100,
                      cond = 0,
                      ddmodel = 0) {
  MLE_obs <- DAISIE_ML(
     datalist = datalist,
     initparsopt = initparsopt,
     idparsopt = idparsopt,
     parsfix = parsfix,
     idparsfix = idparsfix,
     idparsnoshift = 6:10,
     res = res,
     ddmodel = ddmodel,
     cond = cond,
     eqmodel = 0,
     x_E = 0.95,
     x_I = 0.98,
     tol = c(1e-04, 1e-05, 1e-07),
     maxiter = 1000 * round((1.25) ^ length(idparsopt)),
     methode = "lsodes",
     optimmethod = "subplex"
     )
  sims <- DAISIE_sim_cr(
     time = datalist$island_age,
     M = datalist$not_present, #add the number of species that are present
     pars = MLE_obs[1:5],
     replicates = endmc,
     sample_freq = 1,
     plot_sims = FALSE
     )
  MLE <- rep(0, endmc)
  LL <- rep(0, endmc)
  for (mc in 1:endmc) {
    MLE[[mc]] <- DAISIE_ML(
       datalist = sims[[mc]],
       initparsopt = MLE_obs[idparsopt],
       idparsopt = idparsopt,
       parsfix = MLE_obs[parsfix],
       idparsfix = idparsfix,
       idparsnoshift = 6:10,
       res = res,
       ddmodel = ddmodel,
       cond = cond,
       eqmodel = 0,
       x_E = 0.95,
       x_I = 0.98,
       tol = c(1e-04, 1e-05, 1e-07),
       maxiter = 1000 * round((1.25) ^ length(idparsopt)),
       methode = "lsodes",
       optimmethod = "subplex"
       )$loglik
    LL[[mc]] <- DAISIE_loglik_all(
       pars1 = MLE[[mc]][1:5],
       pars2 = c(res, ddmodel, cond, 0),
       datalist = datalist,
       methode = "lsodes"
       )
  }
  WIC <- -2 * MLE_obs$loglik - 2 * mean(LL - MLE)
  AICb <- -2 * MLE_obs$loglik - 4 * mean(LL - MLE_obs)
  out <- list(WIC = WIC, AICb = AICb)
  return(out)
}