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Manual for psimpoll and pscomb
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Radiocarbon ages and calibrated dates both have a probability distribution,
normal in the first case, irregular in the second. Although the dates are
known to be in order, because of a stratigraphical relationship, these
distributions may (often) overlap. This means that drawing from these
distributions can produce modelling sequences of ages that include negative
accumulation rates. We can allow this, or we can require that all the modelled
series of ages are always positive all the sequence (i.e. each lower modelled
date is older than the previous one). Menu N6, here, either allows negative
accumulation rates, or prevents them (the default). There can be problems when
they are turned off, discussed further in menu N7.
Toggles from `off' to `on'.
Return to menu N.
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Copyright © 1995-2007 K.D. Bennett
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