STATISTICAL INFREQUENCY

• WHAT IS THE SI DEFINITION?

  when someone has traits/ characteristics/ behaviours that are statistically rare
• HOW MANY STANDARD DEVIATIONS FROM THE MEAN MUST SOMEONE BE TO BE CONSIDERED ABNORMAL?

  over 2
• WHAT PERCENTAGE OF PEOPLE ARE WITHIN ONE STANDARD DEVIATION OF THE MEAN?

  68%
• WHAT PERCENTAGE OF PEOPLE ARE WITHIN 2 STANDARD DEVIATIONS OF THE MEAN?

  95%
• WHAT PERCENTAGE OF PEOPLE ARE OVER 2 STANDARD DEVIATIONS FROM THE MEAN?

  5%
• WHY IS IT A WEAKNESS THAT THE SI DEFINITION CANNOT DISTINGUISH BETWEEN DESIRABLE AND UNDESIRABLE TRAITS?

  cannot determine whether treatment is required or not
• EVALUATION OF STATISTICAL INFREQUENCY?

  +measures objectively (uses numbers)

  -doesn't distinguish between desirable and undesirable traits

  -cannot decide cut-off

  -not all individuals benefit