Why is it generally more difficult to establish the validity of a measure than its reliability?
Answer to relevant QuestionsHow do categorical and quantitative variables differ? What features of an experiment help us to meet the conditions for causal inference? In addition to reliability and validity, what other characteristics should good quality measurements have? How can you use the item-total statistics from the reliability program to decide whether reliability could be improved by dropping some items? The data summarized in Table 21.6 (from a study by Goodwin et al., 1973) show how “becoming a heavy smoker” is related to “having a biological parent who was diagnosed alcoholic.” Either enter these data into SPSS by ...
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