reliability and validity

validity

How far something measures what it is supposed to measure

Face validity

The extent to which a measure at face value, appears to test what it is supposed to

Population validity

The extent to which findings from one sample can be generalized to another

External validity

The extent to which the findings can be generalized outside of the study

Construct validity

The extent to which a measure measures all aspects of a theoretical concept

Criterion validity

The extent to which a measure can predict future behaviours

ecological validity

The extent wo which findings from a study reflect real life behaviour

Internal validity

The extent to which we can be certain our DV is changing because of the manipulation of the IV

Concurrent validity

The extent to which a measure will produce similar results a another measure measuring the same thing

Reliability

How consistent a research study is

Internal reliability

How consistent the materials and measures are within a study

Inter-rater reliability

How far two researchers agree with each other following independent rating of a measure

External reliability

How consistent the measure will be when used on different people and in different places

Split half reliability

How consistent the results of the measure would be if split the test in half, gave them to the participants in theses halves and then correlated them

Test-retest reliability

How consistent the responses of an individual would be if they did the test again

reliability in experiments - lab

high reliability due to standardisation and strict procedures

reliability in experiments - field and Quasi

low reliability as it is often hard to mimic the same conditions of the IV in repeats