Assign treatment for stepped-wedge design

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

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

Value

A data.table with the added treatment assignment

See also

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
#> cluster period ceffect m timeID startTrt rx #> 1: 1 0 -0.03387530 10 1 2 0 #> 2: 1 1 -0.03387530 10 2 2 0 #> 3: 1 2 -0.03387530 10 3 2 1 #> 4: 1 3 -0.03387530 10 4 2 1 #> 5: 1 4 -0.03387530 10 5 2 1 #> --- #> 140: 12 7 -0.06267344 10 140 8 0 #> 141: 12 8 -0.06267344 10 141 8 1 #> 142: 12 9 -0.06267344 10 142 8 1 #> 143: 12 10 -0.06267344 10 143 8 1 #> 144: 12 11 -0.06267344 10 144 8 1
dp <- addPeriods(dc, 12, "cluster") dp <- trtStepWedge(dp, "cluster", nWaves = 2, lenWaves = 1, startPer = 4, lag = 3 ) dp
#> cluster period ceffect m timeID startTrt xr rx #> 1: 1 0 -0.03387530 10 1 4 0 0 #> 2: 1 1 -0.03387530 10 2 4 0 0 #> 3: 1 2 -0.03387530 10 3 4 0 0 #> 4: 1 3 -0.03387530 10 4 4 0 0 #> 5: 1 4 -0.03387530 10 5 4 1 0 #> --- #> 140: 12 7 -0.06267344 10 140 5 1 0 #> 141: 12 8 -0.06267344 10 141 5 0 1 #> 142: 12 9 -0.06267344 10 142 5 0 1 #> 143: 12 10 -0.06267344 10 143 5 0 1 #> 144: 12 11 -0.06267344 10 144 5 0 1