Add an error term for simulation

Adds a residual error term (column .error) to the data frame, drawn from a normal distribution with specified variance.

Usage

add_error(.data, variance = 1)

Arguments

.data

A data frame to which the error term will be added.

variance

Numeric; variance of the residual error (default 1).

Value

A tibble with an added .error column.

Examples

df <- tibble::tibble(x = 1:5)
add_error(df, variance = 2)
#> # A tibble: 5 × 2
#>       x .error
#>   <int>  <dbl>
#> 1     1  0.695
#> 2     2 -1.07 
#> 3     3  0.494
#> 4     4 -0.242
#> 5     5  2.31