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Typically, patients receive questionnaires from two weeks to four months after discharge from t he hospitals. This delay raises concern about t he reliability of t he patient's memory. Memory studies have shown that:

All patients who have been selected to provide feedback should have an equal opportunity to respond. Any situation that makes certain patients less likely to be included in a sample leads to bias. Survey vendors also can minimize sampling bias through:

Weighting of scores is frequently recommended if members of a (patients) population have unequal probabilities of being selected for the sample. If necessary, weights are assigned to the different observations to provide a representation picture of the total population. Weighting should be considered when

The test-retest reliability coefficient is a method to measure instrument reliability. This method measures the degree of correspondence between:

Reliability is a matter of whether a particular technique applied repeatedly to the same object yields the same results each time. The reliability of a survey is initially addressed within ________________.