This function adds staggered study entry times to a simulated data set with illness-death model structure.
addStaggeredEntry(simData, N, accrualParam, accrualValue)(data.frame)
simulated data frame containing entry and exit times
at individual study time scale. See getSimulatedData() for details.
(int)
number of patients.
(string)
possible values are 'time' or 'intensity'.
(number)
specifies the accrual intensity. For accrualParam equal time,
it describes the length of the accrual period. For accrualParam equal intensity, it describes
the number of patients recruited per time unit. If accrualValue is equal to 0,
all patients start at calendar time 0
in the initial state.
This returns a data set containing a single simulated study containing accrual times,
i.e. staggered study entry.
This is a helper function of getSimulatedData().
simData <- data.frame(
id = c(1, 1, 2, 3), from = c(0, 1, 0, 0), to = c(1, 2, "cens", 2),
entry = c(0, 3, 0, 0),
exit = c(3, 5.3, 5.6, 7.2), censTime = c(6.8, 6.8, 5.6, 9.4)
)
addStaggeredEntry(simData, 3, accrualParam = "time", accrualValue = 5)
#> id from to entry exit entryAct exitAct censAct
#> 1 1 0 1 0 3.0 0.5129818 3.512982 7.312982
#> 2 1 1 2 3 5.3 3.5129818 5.812982 7.312982
#> 3 2 0 cens 0 5.6 1.1853786 6.785379 6.785379
#> 4 3 0 2 0 7.2 0.1154988 7.315499 9.515499