defCondition: Add single row to definitions table of conditions that will...

In simstudy: Simulation of Study Data

Add single row to definitions table of conditions that will be used to add data to an existing definitions table

Description

Add single row to definitions table of conditions that will be used to add data to an existing definitions table

Usage

defCondition(
  dtDefs = NULL,
  condition,
  formula,
  variance = 0,
  dist = "normal",
  link = "identity"
)

Arguments

dtDefs	Name of definition table to be modified. Null if this is a new definition.
condition	Formula specifying condition to be checked
formula	An R expression for mean (string)
variance	Number
dist	Distribution. For possibilities, see details
link	The link function for the mean, see details

Value

A data.table named dtName that is an updated data definitions table

See Also

distributions

Examples

# New data set

def <- defData(varname = "x", dist = "noZeroPoisson", formula = 5)
def <- defData(def, varname = "y", dist = "normal", formula = 0, variance = 9)

dt <- genData(10, def)

# Add columns to dt

defC <- defCondition(
  condition = "x == 1", formula = "5 + 2*y",
  variance = 1, dist = "normal"
)

defC <- defCondition(defC,
  condition = "x <= 5 & x >= 2", formula = "3 - 2*y",
  variance = 1, dist = "normal"
)

defC <- defCondition(defC,
  condition = "x >= 6", formula = 1,
  variance = 1, dist = "normal"
)

defC

# Add conditional column with field name "z"

dt <- addCondition(defC, dt, "z")
dt

simstudy documentation built on Nov. 23, 2023, 1:06 a.m.