reliability and validity

What is reliability?

The consistency of a measure or study

What is validity?

Something does what it claims to do

What is face validity?

When something appears to measure what it’s supposed to measure

What is concurrent validity?

The extent to which the results of a test corresponds to those of a previously established measurement

What is temporal validity?

The extent at which the findings of the study are valid when we consider the progressions over time

What is ecological validity?

When the results can be generalised to other settings

What is external validity?

The extent at which the findings can be generalised beyond the study

What is internal validity?

The extent to which the controls have worked and and researcher has only measured the effect of the IV on the DV

What is test-retest reliability?

Increases if a measure yields similar scores on different occasions

What is split-half reliability?

Increases if the odd scale items yield similar score to even scale items

What is inter-rater reliability?

Correlating the judgements of two or more ratings of behaviour to see if results are consistent

What is external reliability?

The extent to which an investigation can be replicated

What is internal reliability?

The internal consistency of measuring instruments