“…7 The analysis of the differences between data from official records and from surveys is a recurrent subject in applied criminology research. References in this area include Kitsuse and Cicourel (1963), Skogan (1976), Cohen and Land (1984), Biderman and Lynch (1991), Figlio (1994), O'Brien (1996), Levitt (1998) and many others. Although the topics covered in this literature are very diverse, the discussion is almost always centered on national data (where the problem is most likely less serious), and nobody addresses the same problem that we are trying to address here.…”