SBIt = SBIt-1[[SIGMA]i vi(Pt/Pt-1)i]
where
SBIt = the proposed SBI value,
SBIt-1 = the existing SBI value,
Pt = the proposed price for rate element "i,"
Pt-1 = the existing price for rate element "i," and
vi = the current estimated revenue weight for rate element "i," calculated as the ratio of the base period demand for the rate element "i" priced at the existing rate, to the base period demand for the entire group of rate elements comprising the service category priced at existing rates.
47 C.F.R. §61.47
For Federal Register citations affecting §61.47, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.fdsys.gov.