calib.t {rice} | R Documentation |
Comparison dates calibrated using both the t distribution (Christen and Perez 2009) and the normal distribution.
Description
Visualise how a date calibrates using the t distribution and the normal distribution.
Usage
calib.t(
y = 2450,
er = 50,
t.a = 3,
t.b = 4,
cc = 1,
postbomb = FALSE,
deltaR = 0,
deltaSTD = 0,
as.F = FALSE,
BCAD = FALSE,
cc.dir = c(),
normal.col = "red",
normal.lwd = 1.5,
t.col = rgb(0, 0, 0, 0.25),
t.border = rgb(0, 0, 0, 0, 0.25),
xlim = c(),
ylim = c()
)
Arguments
y |
The reported mean of the date. |
er |
The reported error of the date. |
t.a |
Value for the t parameter |
t.b |
Value for the t parameter |
cc |
calibration curve for the radiocarbon date(s) (see the |
postbomb |
Which postbomb curve to use for negative 14C dates. |
deltaR |
Age offset (e.g. for marine samples). |
deltaSTD |
Uncertainty of the age offset (1 standard deviation). |
as.F |
Whether or not to calculate ages in the F14C realm. Defaults to |
BCAD |
Which calendar scale to use. Defaults to cal BP, |
cc.dir |
Directory where the calibration curves for C14 dates |
normal.col |
Colour of the normal curve |
normal.lwd |
Line width of the normal curve |
t.col |
Colour of the t histogram |
t.border |
Colour of the border of the t histogram |
xlim |
x axis limits |
ylim |
y axis limits |
Details
Radiocarbon and other dates are usually modelled using the normal distribution (red curve). The t approach (grey distribution) however allows for wider tails and thus tends to better accommodate outlying dates. This distribution requires two parameters, called 'a' and 'b'.
Author(s)
Maarten Blaauw
Examples
calib.t()