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Reliability


Types of reliability:

External reliability
o Consistency between measures
o E.g. a ruler would always measure the same in different situations
o In psychology, an observational study would need to give the same results in
different contexts, for example, observing male/female children's play interactions
at school and at home…

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For example:

In a questionnaire with 50 questions, either

Compare the responses of items 1-25 with those from items 26-50
Or, compare responses from odd numbered items with those from even numbered items

Correlations achieved would be expected to exceed 0.9

4. Item analysis

Useful to use when checking reliability…

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