Types of reliability

Reliability

The extent to which a measure is consistent.

Inter-rater reliability

The extent to which 2 or more observers produce consistent or similar recordings of the same observation / 2 researchers give the same rating of behaviours

Internal reliability

Consistency within a measure

Split-half reliability

The extent to which participants give similar responses in the first and second half of a measure

External reliability

Consistency over time

Test-retest reliability

The extent to which participants give the same score on a measure of two different occasions