Deviation from statistical norms

• Expressed using normal distribution
• People who behave in a normal way are in the bell shape of the graph
• Abnormal poeple make up the tail ends of the graph
• Problems with defining abnormality with statistical infrequency

  Doesn't factor desirability of behaviours (Very high IQ is rare but not a negative thing)
• Problems with defining abnormality with statistical infrequency


  No distinction between rare and slightly odd behaviour and psychologically abnormal behaviour
• Problems with defining abnormality with statistical infrequency


  No definite cut-off point where normal behaviour becomes abnormal behaviour
• Problems with defining abnormality with statistical infrequency


  Some behaviours that are considered psychologically abnormal are quite common