Reliability And Validity Flashcards
Reliability definition
Something is consistent (+ can be replicated)
Name the main different types of reliability
Internal reliability
External reliability
Internal reliability
How consistently a method measures with itself
External reliability
How consistently a method measure over time or between people
Split half method
Used to check the internal reliability of self report measures such as psychometric tests and questionnaires
Involves splitting a test into two and having the same participant doing both halves
If the two halves provide similar results this would suggest that the test has internal reliability
Method to check internal reliability
Split half method
Method to test external reliability
Test retest method
Also:
Inter rated reliability
Test retest method
Asses the external reliability of self report measures
Involves testing the same participants twice over a period of time on the same test
Is the test retest method used for observational research?
No
Observational research is not repeated to check for reliability (test retest)
Inter rater reliability
Reliability of observation is checked via inter rater reliability
Extent to which different observers are able to observe and rate the same behaviour in the same way
Field experiments
How reliable
Low
Laboratory experiment
How reliable
High
Validity definition
Refers to whether something measures what it claims to measure
Interval validity
Related to what actually happens in the study
Refers to whether the IV has had an effect on the DV or whether the DV was caused by some other CV
External validity
Refers to whether the findings of a study really can be generalised beyond the present study
Face validity
Construct validity
Concurrent validity
Criterion validity
Population validity
