Compute index values relative to base year — compute_baseline

Computes index values for specified columns where the earliest year value is set to 100. All subsequent values are expressed as a percentage of the base year value. This is useful for comparing growth trends across multiple time series on a common scale.

Usage

compute_baseline_index(.data, date_col, ...)

Arguments

.data: A data.frame or tibble containing the time series data.
date_col: Unquoted column name containing the time/year variable.
...: Unquoted column names to compute indices for. Each selected column must be numeric.

Value

A tibble with the date column and computed index columns. Index column names are formed by appending "_index" to the original column names.

Examples

if (FALSE) { # \dontrun{
# Compute indices for headcount and labor force
contract_df |>
  compute_baseline_index(year, total_headcount, labor_force_total)
} # }