epiweek()
is a constructor for <grates_epiweek>
objects.
Arguments
- year
[integer]
Vector representing the year associated with
week
.double
vectors will be converted viaas.integer(floor(x))
.- week
[integer]
Vector representing the week associated with `year.
double
vectors will be converted viaas.integer(floor(x))
.
Details
Epiweeks are defined to start on a Sunday and <grates_epiweek>
objects are
stored as the number of weeks (starting at 0) from the first Sunday after the
Unix Epoch (1970-01-01). That is, the number of seven day periods from
1970-01-04.
Internally they have the same representation as a <grates_yearweek_sunday>
object so are akin to an alias but with a marginally more efficient
implementation.