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of the battery, violate a basic assumption underlying computation of the coefficients: that the respective error variances are uncorrelated. Silverstein s (1971) formula corrects for the slight spuriousness. Silverstein (1977b) concurs with Kaufman s (1977) proposed resolution to the question of whether short-form validity coefficients should be corrected: They should be adjusted when the short form is used as a replacement for the total battery (when administered in research studies, for example), but not when the brief version is used for screening purposes such that individuals flagged by the short form are likely to be given the remaining Wechsler subtests. In the preceding sections, any mention of validity coefficients has referred only to the uncorrected coefficients because most clinicians who use a Wechsler short form do so for clinical or screening purposes and give the complete battery if the short-form score (or scatter among the component subtests, or clinical observations during the brief administration) arouse any concern. In such instances, the uncorrected coefficients are the relevant indexes of validity. If, however, examiners use short forms with no intention of giving the remainder of the battery, the obtained (uncorrected) validity coefficients are a bit high. For Silverstein s (1982a, 1985b) dyad and tetrad, the correction is only .01; for less reliable brief Wechsler short forms, the correction is likely to be about .02 to .03. The correction is, thus, slight, but is something more psychometrically oriented examiners should know. Other statistical topics have also been the subject of debate, and, occasionally, controversy, such as the advantages of using linear equating techniques rather than multiple regression analysis for estimating the IQs from the sums of the short-form scaled scores (Tellegen & Briggs, 1967). Neither the issue of correlated error variance nor the question of the best method of obtaining estimated IQs is of vital magnitude. But such topics point to the fact that the development of short forms from data obtained on com-
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prehensive batteries is filled with a variety of problems that, ultimately, militates against their use in preference to the new group of brief tests that were normed appropriately and specifically developed to stand on their own feet.
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Appropriateness of the New Brief Tests for African Americans and Hispanics
Silverstein s (1982d) Vocabulary Block Design (V BD) WAIS-R short form was hypothesized to underestimate IQs for African Americans (Kaufman, 1990) because the two component subtests typically produce among the largest differences between Caucasians and African Americans (see 4 section on ethnic differences). That hypothesis was given some support in two studies that compared Wechsler short forms that included V BD with short forms that excluded them (Cravens, 1999; Paolo, Ryan, Ward, & Hilmer, 1996). In addition, short forms that include measures of vocabulary are conceivably unfair to Hispanics as well. These criticisms are pertinent to J. Kaufman and A. Kaufman s (in press) strong suggestion to abandon short forms in favor of the new breed of brief tests and to our endorsement of that position. The WASI and WRIT each include Vocabulary and Block Design (or a Block Design clone) among their four component subtests, and the K-BIT includes a vocabulary subtest along with a matrices task. The inclusion of matrices tasks in both the two-subtest and four-subtest versions of the WASI, in the WRIT, and in the K-BIT helps neutralize the influence of vocabulary measures, to some extent, regarding assessment of African Americans and Hispanics because of evidence that ethnic differences on this type of task tend to be relatively small (Kaufman & Kaufman, 1983b, Table 4.35; Kaufman & Wang, 1992; Vincent, 1991; see 4). When examining the WAIS-III ethnic-difference data analyzed by Heaton et al. (2001) and summarized in 4 (controlling for age,
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