View source: R/representativity.R
Weiss 1973, 46f. and Bocquet-Appel and Masset 1977 (see also Herrmann et al. 1990, 306f.) have devised indices which check if the non-adult age groups are represented in proportions as can be expected from modern comparable data. Whether this is really applicable to archaeological data-sets is a matter of debate.
an object of class mortaar_life_table.
Weiss chose the mortality (qx) as deciding factor and claimed that
(1) the probability of death of the age group 10–15 (5q10)
should be lower than that of the group 15–20 (5q15) and that (2)
the latter in turn should be lower than that of age group 0–5
In contrast, Bocquet-Appel and Masset took the raw number of dead (Dx) and asserted that (1) the ratio of those having died between 5 and 10 (5D5) to those having died between 10 and 15 (5D15) should be equal or larger than 2 and that (2) the ratio of those having died between 5 and 15 (10D5) and all adults (>= 20) should be 0.1 or larger.
Due to the specific nature of the indices, they only give meaningful results if 5-year-age categories have been chosen for the non-adults.
data.frame showing the indices and explaining their interpretation.
schleswig <- life.table(schleswig_ma[c("a", "Dx")]) lt.representativity(schleswig)
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