The units (agencies reporting to a national crime statistics programme,
say) that report at least minrep months in every year from y0 to
y1. A year without a record of the unit, or with too few months,
disqualifies it, whatever other units do that year. Counts over time are
comparable only on such a constant panel; a trend from all reporters
mixes change in crime with change in who reports.
Usage
rptc(unit, year, rep, y0, y1, minrep = 12)
Arguments
- unit
The unit of each record: labels, no missing values.
- year
The year of each record: whole numbers.
- rep
The months reported in each record: whole numbers.
- y0, y1
The first and last years, y0 <= y1, from 0.
- minrep
The fewest months that count as reporting: a whole number
from 0.
Value
A data frame with one row per unit (sorted): unit and const
(TRUE for a constant reporter).
References
Maltz, M. D. (1999). Bridging Gaps in Police Crime Data.
Bureau of Justice Statistics, NCJ 176365.
Examples
rptc(unit = c("a", "a", "b", "b", "b"), year = c(2020, 2021, 2020, 2021,
2021), rep = c(12, 12, 12, 6, 12), y0 = 2020, y1 = 2021)
#> unit const
#> 1 a TRUE
#> 2 b TRUE
