Metric data are regularly presented, analyzed, and compared. Despite acknowledgment that metric data can vary both when collected by one observer and when collected by multiple observers, few studies of these sources of variation in archaeological metric data have been undertaken. Intra-observer and inter-observer measurement errors are examined across four dimensions of 23 modern bighorn sheep (Ovis canadensis) astragali and five dimensions of 30 specimens of stone projectile point representing 4 culture-historical (temporal) types. Statistical and graphical analyses indicate that measuring dimensions of the same specimens multiple times facilitates determination of dimensions that can be readily and reliably measured and serves to screen data for data recording errors and for dimensions that may be subject to high levels of intra-observer and inter-observer variation.

Cultural traits have long been used in anthropology as units of transmission that ostensibly reflect behavioural characteristics of the individuals or groups exhibiting the traits. After they are transmitted, cultural traits serve as units of replication in that they can be modified as part of an individual's cultural repertoire through processes such as recombination, loss or partial alteration within an individual's mind. Cultural traits are analogous to genes in that organisms replicate them, but they are also replicators in their own right. No one has ever seen a unit of transmission, either behavioural or genetic, although we can observe the effects of transmission. Fortunately, such units are manifest in artefacts, features and other components of the archaeological record, and they serve as proxies for studying the transmission (and modification) of cultural traits, provided there is analytical clarity over how to define and measure the units that underlie this inheritance process.

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