  In archaeological and paleontological demographic temporal frequency analysis
(dTFA), a handful of protocols for generating temporal frequency distributions
(tfds) have emerged based on the aggregation not of single-point timestamps but
instead of constituent temporal distributions, including probability summation,
kernel density estimation, and human occupation index calculation. While these
protocols bear a striking algebraic resemblance to one another, they are
motivated by the desire to contain fundamentally different sources of
uncertainty, leading to detailed differences in procedure as well as
fundamental differences in the interpretation of the resulting tfd. Rather than
assuming that one technique can fulfil dual purposes based on its formal
resemblance with another, the joint containment of multiple sources of
uncertainty therefore warrants the adoption of propagation-of-uncertainty
techniques in tfd construction.
