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

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
#>     <char>   <num>    <num> <char>   <char>
#> 1:      y1    10.0        3 normal identity
#> 2:      y2     0.5        0 binary identity

dt <- addColumns(def2, dt)
dt
#> Key: <idnum>
#>     idnum   xNr     xUni        y1    y2
#>     <int> <num>    <num>     <num> <int>
#>  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