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Test- Retest Reliability
extent to which answers to the same instrument correlate when measure the same population over two different time periods
1. administer the SAME test/measure at two different times to the SAME groups of participants
Internal Reliability
used to assess the reliability of the survey instruments
involves calculating correlation coefficients of each item/question of the survey
(good > 0.80)
Cronbach's Alpha
measures internal reliability
Coefficient alpha should exceed 0.70
Correlation
shows how strong the relationship of 2 variables are of a single participant's responses to both the tests/measurements
Correlation Coefficient ranges between 0 to.
0 = NO reliability/similarity/correlation
1 = perfect correlation
Below 0.50 = poor reliability/correlation
Between 0.50 - 0.75 = moderate reliability
Over 0.75 = correlation
* interpretations of the coefficient depends on measurement
Increase reliability by _____
1. Decreasing Error
2. Increasing Sample Size
3. eliminate UNCLEAR questions
4. Standardize testing conditions
5. Moderate the degree of difficulty of the test
6. Minimize the effects of external events
7. Standardize instructions
8. Maintain consistent scoring procedures
9. Decreasing Bias
risk ratio
if you have exposure - are you likely to die?
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