The third approach to reliability, i.e., the internal consistency, uses only one administration of an instrument or test to assess the consistency or homogeneity among the items. In the 1993 IDD prevalence survey in Bangladesh, for example, eight physicians measured the goiter grade of a single person at a single point of time to assess the extent of error incurred in the measurement due to the physicians. Thus, while stability is concerned with personal and situational fluctuations from one time to another, equivalence is concerned with variations at one point in time among observers and samples of items.Ī good way to assess the equivalence of measurement by different observers is to compare their scoring or evaluating of the same event.
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