init_status.net: Disease Status Initialization Module for netsim

In EpiModel: Mathematical Modeling of Infectious Disease Dynamics

Disease Status Initialization Module for netsim

Description

This function sets the initial disease status on the network given the specified initial conditions.

Usage

init_status.net(dat)

Arguments

dat	Main netsim_dat object containing a networkDynamic object and other initialization information passed from netsim.

Details

This internal function sets, either randomly or deterministically, the nodes that are infected at t_1, the starting time of network simulations. If the number to be initially infected is passed, this function sets the initial number infected based on the number specified, either as a set of random draws from a binomial distribution or as the exact number specified. In either case, the specific nodes infected are a random sample from the network. In contrast, a set of specific nodes may be infected by passing a vector containing the status of each node to netsim.

For the initially infected nodes, this module sets the time of infection as t_1, the starting time of network simulations. For models with vital dynamics, the infection time for those initially infected nodes is a random draw from an exponential distribution with the rate parameter defined by the di.rate argument. For models without vital dynamics, the infection time is a random draw from a uniform distribution of integers with a minimum of 1 and a maximum of the number of time steps in the model. In both cases, to set the infection times to be in the past, these times are multiplied by -1, and 2 is added to allow for possible infection times up until step 2, when the disease simulation time loop starts.

Value

The updated netsim_dat main list object.

See Also

This is an initialization module for netsim.

EpiModel documentation built on July 9, 2023, 5:21 p.m.