![]() Further, the APQ is reliable, simple to administer and is likely to be useful in the assessment and study of problem drinkers in the clinical and research settings. These findings add further weight to the view that alcohol-related problems represent a phenomenon which is conceptually, as well as statistically, distinct from dependence. On the other hand, evaluating validity involves determining whether the instrument measures the correct characteristic. After all, with reliability, you only assess whether the measures are consistent across time, within the instrument, and between observers. The APQ was found to be highly reliable and the previous finding that dependence is a mediating factor in the relationship between consumption and problems was replicated. Validity is more difficult to evaluate than reliability. Dependence and consumption scores were obtained along with socio-demographic information in order to study the construct validity of the APQ. In the present study 101 subjects participated in a test-retest reliability study. The reliability of the APQ was, however, unknown. It has been used to study the relationship between alcohol-related problems and dependence within the bi-axial model. The first example is the classic example you will find in many statistics textbooks that comes from archery and is observed in Figure 6.1 below. To be clear from the beginning, valid data must be reliable, but not all reliable data are valid. The Alcohol Problems Questionnaire (APQ) was designed as a clinical instrument for measuring alcohol-related problems. Let’s take a look at two examples to differentiate between reliability and validity.
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