The CQL commands R_Date, F14C_Date, C_Date and Date are used to
describe individual dated events in a model. R_Date and F14C_Date
represent radiocarbon dates expressed in radiocarbon years (the conventional
radiocarbon age, CRA) or fraction modern (F14C) respectively.
C_Date represents a calendar date. Date directly specifies a date in
OxCal's internal format.
Usage
cql_r_date(name, date, error)
cql_c_date(name, date, error)
cql_r_f14c(name, date, error)
cql_date(name, date)Arguments
- name
Character. Date label(s), usually a lab code.
- date
Numeric. Date or dates expressed in radiocarbon years (
cql_r_date()), F14C (cql_f14c_date()), calendar years (cql_c_date()), or OxCal's internal format (cql_date()) See details.- error
Integer. Uncertainty associated with the date(s).
Details
The era expected for calendar dates (BP or BC/AD) depends on a global option in OxCal, which defaults to BC/AD. BC dates are specified as negative values.
F14C measurements are recommended for modern, "post-bomb" radiocarbon dates (Reimer et al. 2004) .
OxCal's internal date format, used with Date(), is a decimal Gregorian
year, for details see: https://c14.arch.ox.ac.uk/oxcalhelp/hlp_analysis_calend.html
References
https://c14.arch.ox.ac.uk/oxcalhelp/hlp_analysis_inform.html#date
https://c14.arch.ox.ac.uk/oxcalhelp/hlp_commands.html
Reimer PJ, Brown TA, Reimer RW (2004). “Discussion: Reporting and Calibration of Post-Bomb 14C Data.” Radiocarbon, 46(3), 1299--1304. ISSN 0033-8222, 1945-5755, doi:10.1017/S0033822200033154 .
See also
Other CQL functions:
cql_boundary(),
cql_n(),
cql_options(),
cql_other,
cql_phase(),
cql_sequence(),
cql(),
write_oxcal()