I/B/E/S International Inc. created their Academic Research Program over 30 years ago to provide both summary and individual analyst forecasts of company earnings, cash flows, and other important financial items, as well as buy-sell-hold recommendations. In 2000, I/B/E/S was integrated with Thomson Reuters / First Call, and in 2012 First Call was discontinued.
As of October 18, 2018, Thomson-Reuters changed the identifiers of a large number of brokers and analysts in I/B/E/S. It is likely that 13.8% of all broker IDs (ESTIMATOR) and 30.7% of all analyst IDs (ANALYS) have been reassigned. While the October 2018 change affected a large portion of the sample, WRDS has also become aware of a different issue wherein individual broker IDs (and all affected analysts) have been and will continue to be subject to reshuffle without warning. The safest course of action may be to treat each data vintage as an entirely separate sample. See this document for more detail.
Additionally, UBS Equities was removed from I/B/E/S Detail History.