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

Source: R/define_data.R

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

defDataAdd(
  dtDefs = NULL,
  varname,
  formula,
  variance = 0,
  dist = "normal",
  link = "identity"
)

Arguments

dtDefs

Name of definition table to be modified. Null if this is a new definition.

varname

Name (string) of new variable

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 = "xNr", dist = "nonrandom", formula = 7, id = "idnum")
def <- defData(def, varname = "xUni", dist = "uniform", formula = "10;20")

dt <- genData(10, def)

# Add columns to dt

def2 <- defDataAdd(varname = "y1", formula = 10, variance = 3)
def2 <- defDataAdd(def2, varname = "y2", formula = .5, dist = "binary")
def2
#>    varname formula variance   dist     link
#> 1:      y1    10.0        3 normal identity
#> 2:      y2     0.5        0 binary identity

dt <- addColumns(def2, dt)
dt
#>     idnum xNr     xUni        y1 y2
#>  1:     1   7 18.10197  8.704022  1
#>  2:     2   7 10.06193 12.713904  0
#>  3:     3   7 13.95427  8.827621  0
#>  4:     4   7 18.59115  7.158750  1
#>  5:     5   7 13.56085  9.057990  0
#>  6:     6   7 15.61046 11.386552  0
#>  7:     7   7 15.18909  8.796868  0
#>  8:     8   7 17.38799  7.889894  1
#>  9:     9   7 11.79224  9.181361  1
#> 10:    10   7 10.26153 12.108837  0