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Psychology
Introducing key terms - Reliability
Read the words and discuss what you think they might mean before revealing the definition.
Internal reliability — The extent to which a test or measure is consistent within itself e.g. the use of a standardised instructions and procedure for all participants.
External reliability — The extent to which a test produces consistent results over several occasions.
Ways of dealing with reliability — A measure which improves consistency and accuracy within the results e.g. the use of a standardised procedure or measures such as counterbalancing.
Assessing reliability* — Measures used to check the consistency of a set of results.
Inter-rater reliability* — Where two or more psychologists produce consistent results by using a standardised procedure, agreed coding system, or correlation of their data.
Test-retest reliability* — Involves testing and retesting the same participants over time, with the same test, and comparing their scores. If the scores are the same the test has external reliability.
Split-half reliability* —
Involves splitting a pp’s test answers in half and seeing whether s/he got the same or similar scores on the two halves. If so, internal reliability is high; if not, it is low and individual questions would need to be redesigned.