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The Polygraph and Lie Detection
FIGURE H-10 Accuracy index (A) values for seven field datasets. NOTE: Vertical lines are the length of one standard error; they extend downward from the accuracy index value for convenience of presentation.
the smaller set of studies with internal validity rating of less than or equal to 3 (contrasting with the criterion of less than 3 used for laboratory studies). Only two of the seven field studies met this criterion and also had salience ratings of better (i.e., lower) than 3. Their associated A values were 0.91 and 0.89, close to the median A of 0.89 for the seven datasets. Thus, the results of the field studies, if taken literally, suggest that the average accuracy of polygraph testing in field specific-incident investigations is similar to and may be slightly higher than that found in polygraph accuracy studies using laboratory models. However, inas-