Converts the given frequency of use to the reference units of Table 3
of the INRS method (hours/day or days/month or days/year, depending on
the input unit) and returns the corresponding class (0 to 4).
Usage
inrs_frequency_class(
value = NA_real_,
unit = c("minutes", "hours", "days", "months", "not_used")
)
Arguments
- value
Numeric. Frequency value. Ignored if unit = "not_used".
- unit
Character. One of "minutes", "hours", "days",
"months", "not_used" (the latter for substances that are not used
with a periodic frequency, and always returns class "0").
Value
Character scalar ("0" to "4"), or NA_character_ if there
is no match in the reference table.
Examples
inrs_frequency_class(3, "hours")
#> [1] "3"
inrs_frequency_class(unit = "not_used")
#> [1] "0"
