This function is designed for use with panel_data()
objects.
Arguments
- data
A data frame, typically of
panel_data()
class.- ...
Variable names. If none are given, all variables are checked.
- type
Check for variance over time or across individuals? Default is
"time"
."individual"
considers variables like age to be non-varying because everyone ages at the same speed.
Examples
wages <- panel_data(WageData, id = id, wave = t)
wages %>% are_varying(occ, ind, fem, blk)
#> occ ind fem blk
#> TRUE TRUE FALSE FALSE