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Rescale a variable (e.g., from 5-point to 7-point).

Usage

RESCALE(var, from = range(var, na.rm = T), to)

Arguments

var

Variable (numeric).

from

Numeric vector, the range of old scale (e.g., 1:5). If not defined, it will compute the range of var.

to

Numeric vector, the range of new scale (e.g., 1:7).

Value

A vector of rescaled variable.

Examples

d = data.table(var=rep(1:5, 2))
added(d, {
  var1 = RESCALE(var, to=1:7)
  var2 = RESCALE(var, from=1:5, to=1:7)
})
d  # var1 is equal to var2
#>     var var1 var2
#>  1:   1  1.0  1.0
#>  2:   2  2.5  2.5
#>  3:   3  4.0  4.0
#>  4:   4  5.5  5.5
#>  5:   5  7.0  7.0
#>  6:   1  1.0  1.0
#>  7:   2  2.5  2.5
#>  8:   3  4.0  4.0
#>  9:   4  5.5  5.5
#> 10:   5  7.0  7.0