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Define repeated variables

Source: R/specification.R
repeat_variables.Rd

Define repeated variables

Usage

repeat_variables(
  n,
  prefix,
  formula,
  variance = 0,
  distribution = .simulab_distributions,
  link = c("identity", "log", "logit")
)

Arguments

n

Number of variables.

prefix

Variable-name prefix.

Arguments passed to define_variable().

Value

A simulab_spec base data.frame with one row per repeated variable.

Examples

specification <- repeat_variables(
  n = 3, prefix = "item", formula = "0", variance = "1", distribution = "normal"
)
specification
#>   variable distribution formula variance     link
#> 1    item1       normal       0        1 identity
#> 2    item2       normal       0        1 identity
#> 3    item3       normal       0        1 identity
head(simulate_study(n = 20, specification = specification, seed = 1))
#> <simulab_sim:study> 6 rows x 4 columns
#>   id      item1       item2      item3
#> 1  1 -0.6264538  0.91897737 -0.1645236
#> 2  2  0.1836433  0.78213630 -0.2533617
#> 3  3 -0.8356286  0.07456498  0.6969634
#> 4  4  1.5952808 -1.98935170  0.5566632
#> 5  5  0.3295078  0.61982575 -0.6887557
#> 6  6 -0.8204684 -0.05612874 -0.7074952
#> 
#> Truth (definitions):
#>   variable distribution formula variance     link
#> 1    item1       normal       0        1 identity
#> 2    item2       normal       0        1 identity
#> 3    item3       normal       0        1 identity
#> 
#> Other tables: metadata. Read one with as.data.frame(x, what = "metadata").