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Reliability The consistency of a research study or measuring test…
Reliability
The consistency of a research study or measuring test
Internal Reliability
- Consistency inside the study
Overcoming Issues
Thoroughly train researchers to ensure researcher consistency
Standardise the measures - ensure they are of the same difficulty
Standardise procedures to ensure researcher consistency
Standardise each item or question within the study
Clearly operationalise variables - this means there is less room for different interpretations
Assessment
Inter-Rater Reliability - carry out a pilot study on the same participants, if the researchers are in 80% or more agreement then they are consistent
Pilot different measures on the same participants without changing the conditions and then compare their scores to ensure consistency
Split-Half Method - measure participant behaviour using the 1st half of the test, then check consistency by checking if the scores in the 2nd half are similar
Issues
Within the measure - if a measure has more than one question or item, are they consistently measuring the same thing
More than one measure - if more than one test is used is there consistency within the challenge of each
More than one researcher - is there consistency in how they interpret the behaviour/carrying out the study
External Reliability
- Whether the findings are consistent outside the study
Overcoming Issues
Ensure tests are designed in relation to measuring behaviours, attitudes etc. beyond one setting or time
Assessment
Test-re-test
- the same participants repeat the same test at another time to show consistency
Issues
Behaviour is only measured once - the test may not measure behaviour consistently at other times