To run the weighted head-banging algorithm, a parameter called the number of triples must be selected and the weights need to be specified. At each county where data is present, a set of triples (a triple for a county is represented by the county itself and two nearby counties) were selected based on the criteria proposed by Hansen [21]. The weight of county s, denoted by w(s), comes from the inverse of the standard error of p^(s), with p^W(s) replacing p^(s):