Official statistics are statistics that some sort of governing body have signed off on. Unofficial statistics are stats on anything, they have not been approved for one reason or another.
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In Canada, the major official sources are through statistics (stats canada) as well as police recorded information as well as Juristat (the courts). Unofficial crime sources are really any agency that is not involved in the criminal justice system. So word of mouth, acquaintances, and opinions of those not necessarily working within a criminal justice agency.
data classification in statistics
The difference between two variances
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Statistic is singular; statistics is plural. Statistic is a single data point. Statistics is the study of collections of related data points.