Identify duplicate unit-time cells

panel_duplicates() returns unit-time combinations that appear more than once in a panel dataset.

Usage

panel_duplicates(data, id, time)

Arguments

data

A data frame or tibble.

id

Unquoted column name identifying the panel unit.

time

Unquoted column name identifying the time period.

Value

A tibble containing duplicate unit-time combinations and a count column n.

Details

Duplicate unit-time cells occur when the same panel unit appears more than once in the same time period. These duplicates can create problems for panel completion, fixed effects models, difference-in-differences designs, and other longitudinal-data workflows.

The function does not modify, drop, aggregate, or impute the data.

See also

audit_panel(), duplicate_summary(), duplicate_cells(), flag_panel_issues()

Examples

panel_duplicates(example_panel, id = id, time = year)
#>   id year n
#> 1  1 2021 2