Sixty-two first grade children in Israel were tested on the WPPSI, and most of them were retested a year later using objective measures of Reading and Arithmetic. The scores of the intelligence and achievement tests were correlated to provide estimates of the predictive validity of the WPPSI. Results revealed the Israeli WPPSI to be highly valid for prediction of school achievement.
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Lieblich et al. (1975) studied this question.
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