2 The primacy of data collection
2.1 Why data collection comes first
2.2 Measuring disease: sensitivity and specificity
2.3 Measuring exposure: validity and reliability
2.4 Misclassification and its effects
2.5 Completeness of the data
2.6 Problems
2.2 Measuring disease: sensitivity and specificity
2.3 Measuring exposure: validity and reliability
2.4 Misclassification and its effects
2.5 Completeness of the data
2.6 Problems
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