Middle and Late Bronze Age Metal Tools from the Aegean, Eastern ...

data coded in this manner, it became possible to assess the level of similarity—in terms
of the tool selections—between each hoard.
When presence/absence variables are compared between two hoards, there are
four possible combinations for each variable being compared: present – present (a);
absent – present (b); present – absent (c); absent – absent (d). 620 Since it was unimportant
if a variable was missing in two hoards, I decided to exclude the absent – absent
scenarios in my analysis. Therefore, I used Jaccard’s Coefficient formula to determine a
similarity coefficient (based on the 12 tool variables) for every possible hoard pairing. 621
Drennen defines Jaccard’s Coefficient as:
It is the [total] number of present – present matches divided by the [total] number of