CPIW, for example, which is calculated using the reweighting method, can give slightly better predictions of the total CPI and bears a somewhat tighter relationship to the long-run trends in the total CPI. These differences are very minor, however, and are offset by other considerations such as ease of understanding. For this reason, CPIX is still the Bank's preferred core measure.
Nevertheless, given the demonstrated strengths of CPIW and one  BIS Review 112/2008  3  or two other trend measures, the Bank continues to monitor a set of indicators rather than relying on any single one.