dot-prep_eq5d function

Data checking/preparation: EQ-5D variables

This function prepares a data frame for analysis by extracting, processing, and adding columns for EQ-5D variables, including state, LSS (Level Sum Score), LFS (Level Frequency Score) and utility.

.prep_eq5d(
  df,
  names,
  add_state = FALSE,
  add_lss = FALSE,
  add_lfs = FALSE,
  add_utility = FALSE,
  eq5d_version = NULL,
  country = NULL
)

Arguments

• df: a data frame of EQ-5D scores
• names: character vector of length 5 with names of EQ-5D variables in the data frame. The variables should be in an integer format.
• add_state: logical indicating whether the EQ-5D state should be added
• add_lss: logical indicating whether the LSS (Level Sum Score) should be added
• add_lfs: logical indicating whether the LFS (Level Frequency Score) should be added
• add_utility: logical indicating whether the utility should be added
• eq5d_version: character indicating the version of the EQ-5D questionnaire to use (either "3L" or "5L")
• country: character indicating the country to retrieve the quality of life score for

Returns

a modified data frame with EQ-5D domain columns renamed to default names, and, if necessary, with added columns for state, LSS, LFS, and/or utility. If any of the checks fail (e.g. EQ-5D columns are not in an integer format), an error message is displayed and the function is stopping.

Examples

set.seed(1234)
df <- data.frame(mo = sample(1:5, 3), sc = sample(1:5, 3), 
  ua = sample(1:5, 3), pd = sample(1:5, 3), ad = sample(1:5, 3))
.prep_eq5d(df, names = c("mo", "sc", "ua", "pd", "ad"), 
  add_state = TRUE, add_lss = TRUE)
.prep_eq5d(df, names = c("mo", "sc", "ua", "pd", "ad"),
  add_state = TRUE, add_lss = TRUE, add_lfs = TRUE, add_utility = TRUE,
  eq5d_version = "5L", country = "Denmark")