simstudy (version 0.7.0)

trtStepWedge: Assign treatment for stepped-wedge design

Description

Assign treatment for stepped-wedge design

Usage

trtStepWedge(
  dtName,
  clustID,
  nWaves,
  lenWaves,
  startPer,
  perName = "period",
  grpName = "rx",
  lag = 0,
  xrName = "xr"
)

Value

A data.table with the added treatment assignment

Arguments

dtName

data table

clustID

string representing name of column of cluster level ids

nWaves

number of treatment waves

lenWaves

the number of periods between waves

startPer

the starting period of the first wave

perName

string representing name of column of time periods

grpName

string representing variable name for treatment or exposure group

lag

integer representing length of transition period

xrName

string representing name of the field that indicates whether the cluster status is in transition status

See Also

trtObserve trtAssign

Examples

defc <- defData(
  varname = "ceffect", formula = 0, variance = 0.10,
  dist = "normal", id = "cluster"
)
defc <- defData(defc, "m", formula = 10, dist = "nonrandom")

# Will generate 3 waves of 4 clusters each - starting 2, 5, and 8

dc <- genData(12, defc)
dp <- addPeriods(dc, 12, "cluster")
dp <- trtStepWedge(dp, "cluster",
  nWaves = 3,
  lenWaves = 3, startPer = 2
)
dp

dp <- addPeriods(dc, 12, "cluster")
dp <- trtStepWedge(dp, "cluster",
  nWaves = 2,
  lenWaves = 1, startPer = 4, lag = 3
)
dp