For instance, the dependence of the corrections on other information (such as
regional station moves, which in itself has been found on occasion to be inaccurate) can be considered an indication of the uncertainty and limitations of the «corrective approach» that is being sought.
In the Berkeley approach, the optimal combination of
station records isn't really that important, as they are all treated as different segments for the purposes of creating a
regional estimate (as the scalpel will cut
stations at any documented
station move).