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Validating scales and indexes

Validating scales and indexes


If two measures have comparable face, content, and construct validity the more repeatable one may be preferred for the study of a given population. The obvious problem, that the criterion varies from person to person, was eventually solved by establishing a fundamental unit and defining all others in terms of it. Cardiac stroke volume, for example, can be measured only indirectly. The relevant theory was developed in the social sciences in the context of questionnaire scales. If not, do the items really measure the same thing? On the other hand, if the items are too similar, some may be redundant. Such measurements have criterion validity, meaning that we can take some known quantity and compare our measurement with it. A phobia scale which asked about fear of dogs, spiders, snakes, and cats but ignored height, confined spaces, and crowds would not do this. In assessing the reliability of a website quality scale, it is easy to get several observers to apply the scale independently. The simplest measurements, such as length and distance, can be validated by an objective criterion.

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Validating scales and indexes. Validating scales and indexes.

Validating scales and indexes


If two measures have comparable face, content, and construct validity the more repeatable one may be preferred for the study of a given population. The obvious problem, that the criterion varies from person to person, was eventually solved by establishing a fundamental unit and defining all others in terms of it. Cardiac stroke volume, for example, can be measured only indirectly. The relevant theory was developed in the social sciences in the context of questionnaire scales. If not, do the items really measure the same thing? On the other hand, if the items are too similar, some may be redundant. Such measurements have criterion validity, meaning that we can take some known quantity and compare our measurement with it. A phobia scale which asked about fear of dogs, spiders, snakes, and cats but ignored height, confined spaces, and crowds would not do this. In assessing the reliability of a website quality scale, it is easy to get several observers to apply the scale independently. The simplest measurements, such as length and distance, can be validated by an objective criterion.

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