Official statistics on crime are used extensively by sociologists as indicators of the amount &type of crime and the background of offenders, even though they cannot represent the "real" rate of crime.
Much crime is invisible, because most crime is under-reported for a number of reasons, including:
• victims do not know a crime has been committed upon them
- victims make the decision not to report a crime because of embarrassment or trivial nature of the crime.
- decisions by the police to deal with crime unofficially rather than officially
- difficulty of detecting some crimes…