nosoi (version 1.0.0)

sampleTransmissionTreeFromExiting: Sample the transmission tree (phylogenetic tree-like) among the exited hosts

Description

Sample a full transmission tree. This function allows for sampling only exited (i.e. inactive) individuals (e.g. when the sampling procedure is destructive or cuts the hosts from the population). Beware because it does not influence the epidemiological process, it only means that the host has been sampled when exiting the simulation.

Usage

sampleTransmissionTreeFromExiting(tree, hosts)

Arguments

tree

a treedata object created by function getTransmissionTree

hosts

a vector of dead hosts to sample

Value

A tree of class treedata, containing a phylogenetic tree based on the transmission chain and the mapped data at all the nodes.

Details

The tree needs to be produced by function getTransmissionTree applied on the same nosoiSim object.

See Also

For exporting the annotated tree to other software packages, see functions in treeio (e.g. write.beast).

To get the full transmission matrix, see getTransmissionTree.

For sampling among non-dead individuals, see sampleTransmissionTree.

Examples

# NOT RUN {
t_incub_fct <- function(x){rnorm(x,mean = 5,sd=1)}
p_max_fct <- function(x){rbeta(x,shape1 = 5,shape2=2)}
p_Exit_fct  <- function(t){return(0.08)}
p_Move_fct  <- function(t){return(0.1)}

proba <- function(t,p_max,t_incub){
  if(t <= t_incub){p=0}
  if(t >= t_incub){p=p_max}
  return(p)
}

time_contact = function(t){round(rnorm(1, 3, 1), 0)}

transition.matrix = matrix(c(0, 0.2, 0.4, 0.5, 0, 0.6, 0.5, 0.8, 0),
                           nrow = 3, ncol = 3,
                           dimnames = list(c("A", "B", "C"), c("A", "B", "C")))

set.seed(805)
test.nosoi <- nosoiSim(type="single", popStructure="discrete",
                        length=20,
                        max.infected=100,
                        init.individuals=1,
                        init.structure="A",
                        structure.matrix=transition.matrix,
                        pMove=p_Move_fct,
                        param.pMove=NA,
                        nContact=time_contact,
                        param.nContact=NA,
                        pTrans = proba,
                        param.pTrans = list(p_max=p_max_fct,
                                            t_incub=t_incub_fct),
                        pExit=p_Exit_fct,
                        param.pExit=NA
)

## Full transmission tree
ttreedata <- getTransmissionTree(test.nosoi)
plot(ttreedata@phylo)

## Sampling "non dead" individuals
hID <- c("H-1", "H-7", "H-15", "H-100")
samples <- data.table(hosts = hID,
                      times = c(5.2, 9.3, 10.2, 16),
                      labels = paste0(hID, "-s"))

sampledTree <- sampleTransmissionTree(test.nosoi, ttreedata, samples)
plot(sampledTree@phylo)

## Sampling "dead" individuals
sampledDeadTree <- sampleTransmissionTreeFromExiting(ttreedata, hID)
plot(sampledDeadTree@phylo)
# }
# NOT RUN {
# }

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