Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Crime statistics attempt to provide statistical measures of the crime in societies. Given that crime is secretive by nature, measurements of it are likely to be inaccurate.Several methods for measuring crime exist, including household surveys, hospital or insurance records, and compilations by police and similar law enforcement agencies. Typically official crime statistics are the latter, but some offences are likely to go unreported to the police. Public surveys are sometimes conducted to estimate the amount of crime not reported to police. Such surveys are usually more reliable for assessing trends. Public surveys rarely encompass all crime, rarely procure statistics useful for local crime prevention, often ignore offences against children, and do not count offenders brought before the criminal justice system.