To calculate the standard deviation of those numbers: 1  1. 2  2. Then for each number: subtract the Mean and square the result. 3  3. Then work out the mean of those squared differences. 4  4. Take the square root of that and we are done!o calculate the standard deviation of those numbers: 1  1. 2  Work out the Mean (the simple average of the numbers). 3  2. Then for each number: subtract the Mean and square the result.
FBI-Law Enforcement Executive Development Association is a private 501 (c)(3) nonprofit organization and is not a part of the Federal Bureau of Investigation or acting on behalf of the FBI.
Law Enforcement Accreditation. While not a type of law enforcement agency, one designation to look for when evaluating departments is CALEA Accreditation. CALEA, which stands for the Commission on Accreditation for Law Enforcement Agencies, is the international authority on law enforcement standards.