older: Find the probability of a calibrated date being older than a...

In rice: Radiocarbon Equations

Find the probability of a calibrated date being older than a certain age

Description

Find the probability of a calibrated date being older than an age x.

Find the probability that a sample is older than a certain calendar age x, by calculating the proportion of the calibrated distribution 'after' x (i.e., 1 - the summed calibrated distribution up to year x).

Usage

older(
  x,
  y,
  er,
  cc = 1,
  postbomb = FALSE,
  deltaR = 0,
  deltaSTD = 0,
  normal = TRUE,
  as.F = FALSE,
  is.F = FALSE,
  t.a = 3,
  t.b = 4,
  BCAD = FALSE,
  threshold = 0
)

Arguments

x	The year of interest, in cal BP by default.
y	The radiocarbon date's mean.
er	The radiocarbon date's lab error.
cc	calibration curve for the radiocarbon date(s) (see the rintcal package).
postbomb	Whether or not to use a postbomb curve (see caldist()).
deltaR	Age offset (e.g. for marine samples).
deltaSTD	Uncertainty of the age offset (1 standard deviation).
normal	Use the normal distribution to calibrate dates (default TRUE). The alternative is to use the t model (Christen and Perez 2016).
as.F	Whether or not to calculate ages in the F14C timescale. Defaults to as.F=FALSE, which uses the C14 timescale.
is.F	Use this if the provided date is in the F14C timescale.
t.a	Value a of the t distribution (defaults to 3).
t.b	Value b of the t distribution (defaults to 4).
BCAD	Which calendar scale to use. Defaults to cal BP, BCAD=FALSE.
threshold	Report only values above a threshold. Defaults to threshold=0.

Details

The function can only deal with one date at a time.

Value

The probability of a date being older than a certain calendar age.

Author(s)

Maarten Blaauw

Examples

older(2800, 2450, 20)
older(2400, 2450, 20)
calibrate(160, 20, BCAD=TRUE)
older(1750, 160, 20, BCAD=TRUE)

rice documentation built on Sept. 9, 2025, 5:42 p.m.