genData {simstudy}

Calling function to simulate data

Description

Calling function to simulate data

Usage

genData(n, dtDefs = NULL, id = "id", envir = parent.frame())

Arguments

n

the number of observations required in the data set.

dtDefs

name of definitions data.table/data.frame. If no definitions are provided a data set with ids only is generated.

id

The string defining the id of the record. Will override previously set id name with a warning (unless the old value is 'id'). If the id attribute in dtDefs is NULL will default to 'id'.

envir

Environment the data definitions are evaluated in. Defaults to base::parent.frame.

Value

A data.table that contains the simulated data.

Examples

genData(5)
genData(5, id = "grpID")

def <- defData(
  varname = "xNr", dist = "nonrandom", formula = 7,
  id = "idnum"
)
def <- defData(def,
  varname = "xUni", dist = "uniform",
  formula = "10;20"
)
def <- defData(def,
  varname = "xNorm", formula = "xNr + xUni * 2",
  dist = "normal", variance = 8
)
def <- defData(def,
  varname = "xPois", dist = "poisson",
  formula = "xNr - 0.2 * xUni", link = "log"
)
def <- defData(def,
  varname = "xCat", formula = "0.3;0.2;0.5",
  dist = "categorical"
)
def <- defData(def,
  varname = "xGamma", dist = "gamma", formula = "5+xCat",
  variance = 1, link = "log"
)
def <- defData(def,
  varname = "xBin", dist = "binary", formula = "-3 + xCat",
  link = "logit"
)
def

genData(5, def)