simstudy (version 0.7.0)

updateDefAdd: Update definition table

Description

Updates row definition table created by functions defDataAdd and defReadAdd. (For tables created using defData or defRead use updateDef.)

Usage

updateDefAdd(
  dtDefs,
  changevar,
  newformula = NULL,
  newvariance = NULL,
  newdist = NULL,
  newlink = NULL,
  remove = FALSE
)

Value

A string that represents the desired formula

Arguments

dtDefs

Definition table that will be modified

changevar

Name of field definition that will be changed

newformula

New formula definition (defaults to NULL)

newvariance

New variance specification (defaults to NULL)

newdist

New distribution definition (defaults to NULL)

newlink

New link specification (defaults to NULL)

remove

If set to TRUE, remove definition (defaults to FALSE)

Examples

# Define original data

defs <- defData(varname = "w", formula = 0, variance = 3, dist = "normal")
defs <- defData(defs, varname = "x", formula = "1 + w", variance = 1, dist = "normal")
defs <- defData(defs, varname = "z", formula = 4, variance = 1, dist = "normal")

# Define additional columns

defsA <- defDataAdd(varname = "a", formula = "w + x + z", variance = 2, dist = "normal")

set.seed(2001)
dt <- genData(10, defs)
dt <- addColumns(defsA, dt)
dt

# Modify definition of additional column

defsA <- updateDefAdd(dtDefs = defsA, changevar = "a", newformula = "w+z", newvariance = 1)

set.seed(2001)
dt <- genData(10, defs)
dt <- addColumns(defsA, dt)
dt