calib.t | R Documentation |
Visualise how a date calibrates using the t distribution and the normal distribution.
calib.t(
y = 2450,
error = 50,
t.a = 3,
t.b = 4,
cc = 1,
postbomb = NULL,
cc1 = "IntCal20",
cc2 = "Marine20",
cc3 = "SHCal20",
cc4 = "mixed",
ccdir = "",
Cutoff = 1e-05,
times = 8,
rule = 1
)
y |
The reported mean of the date. |
error |
The reported error of the date. |
t.a |
Value for the t parameter |
t.b |
Value for the t parameter |
cc |
calibration curve for C14 dates (1, 2 or 3). |
postbomb |
Which postbomb curve to use for negative 14C dates |
cc1 |
For northern hemisphere terrestrial C14 dates. |
cc2 |
For marine C14 dates. |
cc3 |
For southern hemisphere C14 dates. |
cc4 |
A custom calibration curve |
ccdir |
Directory where the calibration curves for C14 dates |
Cutoff |
Threshold above which calibrated probabilities are plotted |
times |
8 by default. |
rule |
How should R's approx function deal with extrapolation. If |
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'.
Maarten Blaauw
calib.t()
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