LJUNGQVIST, ALEXANDER; MALLOY, CHRISTOPHER; MARSTON, FELICIA - In: Journal of Finance 64 (2009) 4, pp. 1935-1960
We document widespread changes to the historical I/B/E/S analyst stock recommendations database. Across seven I/B/E/S downloads, obtained between 2000 and 2007, we find that between 6,580 (1.6%) and 97,582 (21.7%) of matched observations are different from one download to the next. The changes...