Table 2 Definitions of key terms
Reliability: indicator of the tool's consistency | Validity: determines whether the tool measures what it was designed to measure |
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Internal consistency: measures the average correlation between all items on a tool Intrarater reliability: an indicator of the tests' stability overtime when it is administered by the same rater Interrater reliability: indicates the consistency of a tool when it is administered by different raters | Construct validity: investigates whether the tool correlates with a theorized construct Criterion validity: can be divided into two categories; concurrent and predictive. Concurrent criterion validity measures the correlation of the tool with other tools that measure the same concepts, preferably a "gold standard" when it exists. Predictive criterion validity examines whether the tool can predict future outcomes. Content validity: assesses whether the tool targets all of the relevant topics related to the concept being measured and that there are no irrelevant items Face validity: an assessment of whether the tool appears to measure the intended concept |