fitCF_MHmcmc: Run the Metropolis-Hastings algorithm for ECFOCF data

In phenology: Tools to Manage a Parametric Function that Describes Phenology and More

Run the Metropolis-Hastings algorithm for ECFOCF data

Description

Run the Metropolis-Hastings algorithm for RMU.data.
The number of iterations is n.iter+n.adapt+1 because the initial likelihood is also displayed.
I recommend thin=1 because the method to estimate SE uses resampling.
As initial point is maximum likelihood, n.adapt = 0 is a good solution.
The parameters intermediate and filename are used to save intermediate results every 'intermediate' iterations (for example 1000). Results are saved in a file of name filename.
The parameter previous is used to indicate the list that has been save using the parameters intermediate and filename. It permits to continue a mcmc search.
These options are used to prevent the consequences of computer crash or if the run is very very long and computer processes at time limited.

Usage

fitCF_MHmcmc(
  result = stop("An output from fitCF() must be provided"),
  n.iter = 10000,
  parametersMCMC = stop("A parameter set from fitCF_MHmcmc_p() must be provided"),
  n.chains = 1,
  n.adapt = 0,
  thin = 1,
  adaptive = FALSE,
  adaptive.lag = 500,
  adaptive.fun = function(x) {
     ifelse(x > 0.234, 1.3, 0.7)
 },
  trace = FALSE,
  traceML = FALSE,
  intermediate = NULL,
  filename = "intermediate.Rdata",
  previous = NULL
)

Arguments

result	An object obtained after a SearchR fit
n.iter	Number of iterations for each step
parametersMCMC	A set of parameters used as initial point for searching with information on priors
n.chains	Number of replicates
n.adapt	Number of iterations before to store outputs
thin	Number of iterations between each stored output
adaptive	Should an adaptive process for SDProp be used
adaptive.lag	Lag to analyze the SDProp value in an adaptive content
adaptive.fun	Function used to change the SDProp
trace	TRUE or FALSE or period, shows progress
traceML	TRUE or FALSE to show ML
intermediate	Period for saving intermediate result, NULL for no save
filename	If intermediate is not NULL, save intermediate result in this file
previous	Previous result to be continued. Can be the filename in which intermediate results are saved.

Details

fitCF_MHmcmc runs the Metropolis-Hastings algorithm for ECFOCF (Bayesian MCMC)

Value

A list with resultMCMC being mcmc.list object, resultLnL being likelihoods and parametersMCMC being the parameters used

Author(s)

Marc Girondot [e-mail]

See Also

Other Model of Clutch Frequency: ECFOCF_f(), ECFOCF_full(), TableECFOCF(), fitCF(), fitCF_MHmcmc_p(), generateCF(), lnLCF(), logLik.ECFOCF(), plot.ECFOCF(), plot.TableECFOCF()

Examples

## Not run: 
library("phenology")
data(MarineTurtles_2002)
ECFOCF_2002 <- TableECFOCF(MarineTurtles_2002)

# Paraetric model for clutch frequency
o_mu1p1_CFp <- fitCF(x = c(mu = 2.1653229641404539, 
                 sd = 1.1465246643327098, 
                 p = 0.25785366120357966), 
                 fixed.parameters=NULL, 
                 data=ECFOCF_2002, hessian = TRUE)
                           
pMCMC <- fitCF_MHmcmc_p(result=o_mu1p1_CFp, accept=TRUE)
fitCF_MCMC <- fitCF_MHmcmc(result = o_mu1p1_CFp, n.iter = 1000, 
                           parametersMCMC = pMCMC, n.chains = 1, n.adapt = 0, 
                           adaptive=TRUE, 
                           thin = 1, trace = TRUE)
                           
plot(fitCF_MCMC, parameters="mu")
plot(fitCF_MCMC, parameters="sd")
plot(fitCF_MCMC, parameters="p", xlim=c(0, 0.5), breaks=seq(from=0, to=0.5, by=0.05))
plot(fitCF_MCMC, parameters="p", transform = invlogit, xlim=c(0, 1), 
     breaks=c(seq(from=0, to=1, by=0.05)))


## End(Not run)

phenology documentation built on Sept. 11, 2024, 6:07 p.m.