Additionally, the standard describes weighting functions formula 2 to calculate the weightings. A currency basket is a portfolio of selected currencies with different weightings. These weightings are approximations, and actual weightings may differ between industries. The CPI base price and weightings are adjusted every two years. The imbalance between these two weightings highlighted the perceived unfairness of the system for Hutu. The consecutive Borda count weightings form an arithmetic progression. In other words, the relative difference between adjacent weightings is fixed at 1/N. The amounts are based on the European Central Bank capital key weightings. These rule weightings can be based upon the priority, reliability or consistency of each rule. Rather, he suggested a refinement to the weightings given to results by a pre-existing table. The possible weightings for an ensemble can be visualized as lying on a simplex.