Statistical infrequency is any behaviour which is numerically uncommon and therefore not seen very often in society.
Example: 95% of IQ scores in the general population are between 70 - 130. Any outside are considered abnormal.
Evaluation
Some statistically infrequent behaviour can be positive
Type: Limitation
- Some statistically abnormal behaviour can be positive, because the behaviour is statistically abnormal does not mean the requirement of treatment
- i.e., IQs over 130 are just as unusual as below 70
- Therefore, statistical infrequency should never be used alone to make a diagnosis
Cut-off points are subjectively determined
Type: Limitation
- Cut-off points are subjectively determined
- People disagree on what constitutes an abnormal lack of sleep and since it is a symptom of depression, it is important to know where the cut-off point lies for a diagnosis to be made
- This means that disagreements about cut-off points make it difficult to define abnormality
Cultural relativism
Type: Limitation
- Classification systems like the DSM are based on Western cultures
- However, cultures differ in terms of statistical infrequency and social norms
- Therefore, there are no universal standards or rules for labelling behaviours as abnormal