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dcm.mods.R
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dcm.mods.R
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#' @title Deterministic Compartmental Model Functions
#'
#' @description These functions parameterize the base deterministic
#' compartmental models solved using the \code{\link{dcm}}
#' function.
#'
#' @param t Time vector, passed into model function internally through
#' \code{\link{dcm}} via the control settings in
#' \code{\link{control.dcm}}.
#' @param t0 Initial conditions for model, passed into model function internally
#' through \code{\link{dcm}} via the initial conditions in
#' \code{\link{init.dcm}}.
#' @param parms Model parameters, passed into model function internally through
#' \code{\link{dcm}} via the parameter settings in
#' \code{\link{param.dcm}}.
#'
#' @details
#' This help page shows the names of all the base deterministic compartmental
#' model functions supported in EpiModel. Base models are those already
#' programmed interally within the software. The model functions may be printed
#' to see their internal structure, either directly on the console or by using
#' the \code{print.mod} argument in \code{\link{control.dcm}}.
#'
#' The naming convention for the models listed here follows the format:
#' \code{mod_<disease type>_<number of groups>_<vital dynamics>}. The supported
#' disease types are SI, SIS, and SIR; the number of groups are 1 or 2; and the
#' vital dynamic options are closed (fixed population composition) or open (with
#' arrivals and departures).
#' @name dcm.mods
#'
NULL
# SI, 1 group, closed pop -------------------------------------------------
#' @rdname dcm.mods
#' @keywords internal
#' @export
mod_SI_1g_cl <- function(t, t0, parms) {
with(as.list(c(t0, parms)), {
# Derivations
num <- s.num + i.num
# Parameters
lambda <- inf.prob * act.rate * i.num / num
if (!is.null(parms$inter.eff) && t >= inter.start) {
lambda <- lambda * (1 - inter.eff)
}
# Flows
si.flow <- lambda * s.num
# ODEs
dS <- -si.flow
dI <- si.flow
# Output
list(c(dS, dI,
si.flow),
num = num)
})
}
# SI, 1 group, open pop ---------------------------------------------------
#' @rdname dcm.mods
#' @keywords internal
#' @export
mod_SI_1g_op <- function(t, t0, parms) {
with(as.list(c(t0, parms)), {
# Derivations
num <- s.num + i.num
# Parameters
lambda <- inf.prob * act.rate * i.num / num
if (!is.null(parms$inter.eff) && t >= inter.start) {
lambda <- lambda * (1 - inter.eff)
}
# Flows
si.flow <- lambda * s.num
a.flow <- a.rate * num
ds.flow <- ds.rate * s.num
di.flow <- di.rate * i.num
# ODEs
dS <- -si.flow + a.flow - ds.flow
dI <- si.flow - di.flow
# Output
list(c(dS, dI,
si.flow, a.flow, ds.flow, di.flow),
num = num)
})
}
# SI, 2 group, closed pop -------------------------------------------------
#' @rdname dcm.mods
#' @keywords internal
#' @export
mod_SI_2g_cl <- function(t, t0, parms) {
with(as.list(c(t0, parms)), {
# Derivations
num.g1 <- s.num + i.num
num.g2 <- s.num.g2 + i.num.g2
# Act Balancing
if (balance == "g1") {
ar.g1 <- act.rate
ar.g2 <- ar.g1 * num.g1 / num.g2
}
if (balance == "g2") {
ar.g2 <- act.rate.g2
ar.g1 <- ar.g2 * num.g2 / num.g1
}
# Group Lambdas
lambda.g1 <- inf.prob * ar.g1 * i.num.g2 / num.g2
lambda.g2 <- inf.prob.g2 * ar.g2 * i.num / num.g1
if (!is.null(parms$inter.eff) && t >= inter.start) {
lambda.g1 <- lambda.g1 * (1 - inter.eff)
lambda.g2 <- lambda.g2 * (1 - inter.eff)
}
# Flows
si.flow <- lambda.g1 * s.num
si.flow.g2 <- lambda.g2 * s.num.g2
# ODEs
dSm1 <- -si.flow
dIm1 <- si.flow
dSm2 <- -si.flow.g2
dIm2 <- si.flow.g2
# Output
list(c(dSm1, dIm1, dSm2, dIm2,
si.flow, si.flow.g2),
num = num.g1, num.g2 = num.g2)
})
}
# SI, 2 group, open pop ---------------------------------------------------
#' @rdname dcm.mods
#' @keywords internal
#' @export
mod_SI_2g_op <- function(t, t0, parms) {
with(as.list(c(t0, parms)), {
# Derivations
num.g1 <- s.num + i.num
num.g2 <- s.num.g2 + i.num.g2
# Act Balancing
if (balance == "g1") {
ar.g1 <- act.rate
ar.g2 <- ar.g1 * num.g1 / num.g2
}
if (balance == "g2") {
ar.g2 <- act.rate.g2
ar.g1 <- ar.g2 * num.g2 / num.g1
}
# Group Lambdas
lambda.g1 <- inf.prob * ar.g1 * i.num.g2 / num.g2
lambda.g2 <- inf.prob.g2 * ar.g2 * i.num / num.g1
if (!is.null(parms$inter.eff) && t >= inter.start) {
lambda.g1 <- lambda.g1 * (1 - inter.eff)
lambda.g2 <- lambda.g2 * (1 - inter.eff)
}
# Flows
si.flow <- lambda.g1 * s.num
si.flow.g2 <- lambda.g2 * s.num.g2
if (is.na(a.rate.g2)) {
a.flow <- a.rate * num.g1
a.flow.g2 <- a.rate * num.g1
} else {
a.flow <- a.rate * num.g1
a.flow.g2 <- a.rate.g2 * num.g2
}
ds.flow <- ds.rate * s.num
ds.flow.g2 <- ds.rate.g2 * s.num.g2
di.flow <- di.rate * i.num
di.flow.g2 <- di.rate.g2 * i.num.g2
# ODEs
dSm1 <- -si.flow + a.flow - ds.flow
dIm1 <- si.flow - di.flow
dSm2 <- -si.flow.g2 + a.flow.g2 - ds.flow.g2
dIm2 <- si.flow.g2 - di.flow.g2
# Output
list(c(dSm1, dIm1, dSm2, dIm2,
si.flow, a.flow, ds.flow, di.flow,
si.flow.g2, a.flow.g2, ds.flow.g2, di.flow.g2),
num = num.g1,
num.g2 = num.g2)
})
}
# SIR, 1 group, closed pop ------------------------------------------------
#' @rdname dcm.mods
#' @keywords internal
#' @export
mod_SIR_1g_cl <- function(t, t0, parms) {
with(as.list(c(t0, parms)), {
# Derivations
num <- s.num + i.num + r.num
# Parameters
lambda <- inf.prob * act.rate * i.num / num
if (!is.null(parms$inter.eff) && t >= inter.start) {
lambda <- lambda * (1 - inter.eff)
}
# Flows
si.flow <- lambda * s.num
ir.flow <- rec.rate * i.num
# ODEs
dS <- -si.flow
dI <- si.flow - ir.flow
dR <- ir.flow
# Output
list(c(dS, dI, dR,
si.flow, ir.flow),
num = num)
})
}
# SIR, 1 group, open pop --------------------------------------------------
#' @rdname dcm.mods
#' @keywords internal
#' @export
mod_SIR_1g_op <- function(t, t0, parms) {
with(as.list(c(t0, parms)), {
# Derivations
num <- s.num + i.num + r.num
# Parameters
lambda <- inf.prob * act.rate * i.num / num
if (!is.null(parms$inter.eff) && t >= inter.start) {
lambda <- lambda * (1 - inter.eff)
}
# Flows
si.flow <- lambda * s.num
ir.flow <- rec.rate * i.num
a.flow <- a.rate * num
ds.flow <- ds.rate * s.num
di.flow <- di.rate * i.num
dr.flow <- dr.rate * r.num
# ODEs
dS <- -si.flow + a.flow - ds.flow
dI <- si.flow - ir.flow - di.flow
dR <- ir.flow - dr.flow
# Output
list(c(dS, dI, dR,
si.flow, ir.flow, a.flow,
ds.flow, di.flow, dr.flow),
num = num)
})
}
# SIR, 2 group, closed pop ------------------------------------------------
#' @rdname dcm.mods
#' @keywords internal
#' @export
mod_SIR_2g_cl <- function(t, t0, parms) {
with(as.list(c(t0, parms)), {
# Derivations
num.g1 <- s.num + i.num + r.num
num.g2 <- s.num.g2 + i.num.g2 + r.num.g2
# Act Balancing
if (balance == "g1") {
ar.g1 <- act.rate
ar.g2 <- ar.g1 * num.g1 / num.g2
}
if (balance == "g2") {
ar.g2 <- act.rate.g2
ar.g1 <- ar.g2 * num.g2 / num.g1
}
# Group Lambdas
lambda.g1 <- inf.prob * ar.g1 * i.num.g2 / num.g2
lambda.g2 <- inf.prob.g2 * ar.g2 * i.num / num.g1
if (!is.null(parms$inter.eff) && t >= inter.start) {
lambda.g1 <- lambda.g1 * (1 - inter.eff)
lambda.g2 <- lambda.g2 * (1 - inter.eff)
}
# Flows
si.flow <- lambda.g1 * s.num
si.flow.g2 <- lambda.g2 * s.num.g2
ir.flow <- rec.rate * i.num
ir.flow.g2 <- rec.rate.g2 * i.num.g2
# ODEs
dSm1 <- -si.flow
dIm1 <- si.flow - ir.flow
dRm1 <- ir.flow
dSm2 <- -si.flow.g2
dIm2 <- si.flow.g2 - ir.flow.g2
dRm2 <- ir.flow.g2
# Output
list(c(dSm1, dIm1, dRm1, dSm2, dIm2, dRm2,
si.flow, ir.flow, si.flow.g2, ir.flow.g2),
num = num.g1,
num.g2 = num.g2)
})
}
# SIR, 2 group, open pop --------------------------------------------------
#' @rdname dcm.mods
#' @keywords internal
#' @export
mod_SIR_2g_op <- function(t, t0, parms) {
with(as.list(c(t0, parms)), {
# Derivations
num.g1 <- s.num + i.num + r.num
num.g2 <- s.num.g2 + i.num.g2 + r.num.g2
# Act Balancing
if (balance == "g1") {
ar.g1 <- act.rate
ar.g2 <- ar.g1 * num.g1 / num.g2
}
if (balance == "g2") {
ar.g2 <- act.rate.g2
ar.g1 <- ar.g2 * num.g2 / num.g1
}
# Group Lambdas
lambda.g1 <- inf.prob * ar.g1 * i.num.g2 / num.g2
lambda.g2 <- inf.prob.g2 * ar.g2 * i.num / num.g1
if (!is.null(parms$inter.eff) && t >= inter.start) {
lambda.g1 <- lambda.g1 * (1 - inter.eff)
lambda.g2 <- lambda.g2 * (1 - inter.eff)
}
# Flows
si.flow <- lambda.g1 * s.num
si.flow.g2 <- lambda.g2 * s.num.g2
ir.flow <- rec.rate * i.num
ir.flow.g2 <- rec.rate.g2 * i.num.g2
if (is.na(a.rate.g2)) {
a.flow <- a.rate * num.g1
a.flow.g2 <- a.rate * num.g1
} else {
a.flow <- a.rate * num.g1
a.flow.g2 <- a.rate.g2 * num.g2
}
ds.flow <- ds.rate * s.num
ds.flow.g2 <- ds.rate.g2 * s.num.g2
di.flow <- di.rate * i.num
di.flow.g2 <- di.rate.g2 * i.num.g2
dr.flow <- dr.rate * r.num
dr.flow.g2 <- dr.rate.g2 * r.num.g2
# ODEs
dSm1 <- -si.flow + a.flow - ds.flow
dIm1 <- si.flow - ir.flow - di.flow
dRm1 <- ir.flow - dr.flow
dSm2 <- -si.flow.g2 + a.flow.g2 - ds.flow.g2
dIm2 <- si.flow.g2 - ir.flow.g2 - di.flow.g2
dRm2 <- ir.flow.g2 - dr.flow.g2
# Output
list(c(dSm1, dIm1, dRm1, dSm2, dIm2, dRm2,
si.flow, ir.flow, a.flow, ds.flow, di.flow, dr.flow,
si.flow.g2, ir.flow.g2, a.flow.g2, ds.flow.g2,
di.flow.g2, dr.flow.g2),
num = num.g1, num.g2 = num.g2)
})
}
# SIS, 1 group, closed pop ------------------------------------------------
#' @rdname dcm.mods
#' @keywords internal
#' @export
mod_SIS_1g_cl <- function(t, t0, parms) {
with(as.list(c(t0, parms)), {
# Derivations
num <- s.num + i.num
# Parameters
lambda <- inf.prob * act.rate * i.num / num
if (!is.null(parms$inter.eff) && t >= inter.start) {
lambda <- lambda * (1 - inter.eff)
}
# Flows
si.flow <- lambda * s.num
is.flow <- rec.rate * i.num
# ODEs
dS <- -si.flow + is.flow
dI <- si.flow - is.flow
# Output
list(c(dS, dI, si.flow, is.flow),
num = num)
})
}
# SIS, 1 group, open pop --------------------------------------------------
#' @rdname dcm.mods
#' @keywords internal
#' @export
mod_SIS_1g_op <- function(t, t0, parms) {
with(as.list(c(t0, parms)), {
# Derivations
num <- s.num + i.num
# Parameters
lambda <- inf.prob * act.rate * i.num / num
if (!is.null(parms$inter.eff) && t >= inter.start) {
lambda <- lambda * (1 - inter.eff)
}
# Flows
si.flow <- lambda * s.num
is.flow <- rec.rate * i.num
a.flow <- a.rate * num
ds.flow <- ds.rate * s.num
di.flow <- di.rate * i.num
# ODEs
dS <- -si.flow + is.flow + a.flow - ds.flow
dI <- si.flow - is.flow - di.flow
# Output
list(c(dS, dI, si.flow, is.flow, a.flow, ds.flow, di.flow),
num = num)
})
}
# SIS, 2 group, closed pop ------------------------------------------------
#' @rdname dcm.mods
#' @keywords internal
#' @export
mod_SIS_2g_cl <- function(t, t0, parms) {
with(as.list(c(t0, parms)), {
# Derivations
num.g1 <- s.num + i.num
num.g2 <- s.num.g2 + i.num.g2
# Act Balancing
if (balance == "g1") {
ar.g1 <- act.rate
ar.g2 <- ar.g1 * num.g1 / num.g2
}
if (balance == "g2") {
ar.g2 <- act.rate.g2
ar.g1 <- ar.g2 * num.g2 / num.g1
}
# Group Lambdas
lambda.g1 <- inf.prob * ar.g1 * i.num.g2 / num.g2
lambda.g2 <- inf.prob.g2 * ar.g2 * i.num / num.g1
if (!is.null(parms$inter.eff) && t >= inter.start) {
lambda.g1 <- lambda.g1 * (1 - inter.eff)
lambda.g2 <- lambda.g2 * (1 - inter.eff)
}
# Flows
si.flow <- lambda.g1 * s.num
is.flow <- rec.rate * i.num
si.flow.g2 <- lambda.g2 * s.num.g2
is.flow.g2 <- rec.rate.g2 * i.num.g2
# ODEs
dSm1 <- -si.flow + is.flow
dIm1 <- si.flow - is.flow
dSm2 <- -si.flow.g2 + is.flow.g2
dIm2 <- si.flow.g2 - is.flow.g2
# Output
list(c(dSm1, dIm1, dSm2, dIm2,
si.flow, is.flow, si.flow.g2, is.flow.g2),
num = num.g1, num.g2 = num.g2)
})
}
# SIS, 2 group, open pop --------------------------------------------------
#' @rdname dcm.mods
#' @keywords internal
#' @export
mod_SIS_2g_op <- function(t, t0, parms) {
with(as.list(c(t0, parms)), {
# Derivations
num.g1 <- s.num + i.num
num.g2 <- s.num.g2 + i.num.g2
# Act Balancing
if (balance == "g1") {
ar.g1 <- act.rate
ar.g2 <- ar.g1 * num.g1 / num.g2
}
if (balance == "g2") {
ar.g2 <- act.rate.g2
ar.g1 <- ar.g2 * num.g2 / num.g1
}
# Group Lambdas
lambda.g1 <- inf.prob * ar.g1 * i.num.g2 / num.g2
lambda.g2 <- inf.prob.g2 * ar.g2 * i.num / num.g1
if (!is.null(parms$inter.eff) && t >= inter.start) {
lambda.g1 <- lambda.g1 * (1 - inter.eff)
lambda.g2 <- lambda.g2 * (1 - inter.eff)
}
# Flows
si.flow <- lambda.g1 * s.num
si.flow.g2 <- lambda.g2 * s.num.g2
is.flow <- rec.rate * i.num
is.flow.g2 <- rec.rate.g2 * i.num.g2
if (is.na(a.rate.g2)) {
a.flow <- a.rate * num.g1
a.flow.g2 <- a.rate * num.g1
} else {
a.flow <- a.rate * num.g1
a.flow.g2 <- a.rate.g2 * num.g2
}
ds.flow <- ds.rate * s.num
ds.flow.g2 <- ds.rate.g2 * s.num.g2
di.flow <- di.rate * i.num
di.flow.g2 <- di.rate.g2 * i.num.g2
# ODEs
dSm1 <- -si.flow + is.flow + a.flow - ds.flow
dIm1 <- si.flow - is.flow - di.flow
dSm2 <- -si.flow.g2 + is.flow.g2 + a.flow.g2 - ds.flow.g2
dIm2 <- si.flow.g2 - is.flow.g2 - di.flow.g2
# Output
list(c(dSm1, dIm1, dSm2, dIm2,
si.flow, is.flow, a.flow, ds.flow, di.flow,
si.flow.g2, is.flow.g2, a.flow.g2, ds.flow.g2, di.flow.g2),
num = num.g1, num.g2 = num.g2)
})
}