Validity

The types of reliability used consist of test-retest reliability and internal consistency where the types of validity that were used are construct validity and criterion validity (vmiman). The test-retest reliability is an assessment of the similarity of scores on a particular scale over two or more test occasions. The Pearson correlation coefficients are used to quantify the similarity between the scale scores over two or more occasions. Stability coefficients provide an important indicator of a test's likely usefulness of measurement.

Internal consistency is known as scale homogeneity and is an assessment of the ability of the items in a scale to measure the same construct or trait. A parameter can be computed that indexes how well the items in a scale contribute to the overall measurement. A scale is internally consistent if all the constituent item responses are positively associated with their scale score. The most common is Cronbach's...
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