For some of these lower level indexes detailed reweighing to make them be available, allowing computations where the individual price observations can all be weighted.
These price observations must usually be made by reading the pricing signs outside stations, as many companies do not give their prices by telephone due to competitive concerns.
These results, however, are based on a very limited number of price observations (fewer than 60 in total) that were not representative of all transactions within these states.
