The special function cox
marks terms in formulae of the functions
twinSIR
and simEpidata
as endemic components,
i.e. variables acting multiplicatively on the baseline infection intensity.
An illustrative twinSIR
call with two epidemic and two endemic
covariates is:
twinSIR(~B1 + B2 + cox(vaccination) + cox(size), data=myEpidata)
.
Technically, this function is implemented as function(x) {x}
and
defined as “special” in terms.formula
.
Usage in formulae of functions twinSIR
and
simEpidata
.