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The ability of a measure to remain the same over time despite uncontrollable testing conditions or the state of the respondents themselves is indicative of its stability and low vulnerability to changes in the situation. This attests to its goodness because the concept is stably measured, no matter when it is done. Two tests of stability are test-retest reliability and parallel form reliability.
Test-retest Reliability:
The reliability coefficient obtained with a repetition of the same measure on a second occasion is called test-retest reliability. That is when a questionnaire containing some items that are supposed to measure concept is administered to a set of respondents now and again to the same respondents say several weeks to 6months later then the correlation between the scores obtained at the two different times from one and the same set of respondents is called the test-retest coefficient. The higher it is the better the test-retest reliability and consequently the ability to measure across time.
Parallel-form reliability:
When responses on two comparable sets of measure tapping the same construct are highly correlated, we have parallel form reliability. Both forms have similar items and the same response format the only changes being the wordings and the order of the questions.
Test-retest Reliability:
The reliability coefficient obtained with a repetition of the same measure on a second occasion is called test-retest reliability. That is when a questionnaire containing some items that are supposed to measure concept is administered to a set of respondents now and again to the same respondents say several weeks to 6months later then the correlation between the scores obtained at the two different times from one and the same set of respondents is called the test-retest coefficient. The higher it is the better the test-retest reliability and consequently the ability to measure across time.
Parallel-form reliability:
When responses on two comparable sets of measure tapping the same construct are highly correlated, we have parallel form reliability. Both forms have similar items and the same response format the only changes being the wordings and the order of the questions.
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