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Composite reading scores obtained from parents of 125 reading-disabled children and 125 matched control children who participated in the Colorado Family Reading Study were used to test the validity of self-reported reading problems. Parents who reported that they encountered serious difficulty learning to read had significantly lower reading scores than did those who reported no positive history of reading problems. Moreover, this difference was larger for parents of reading-disabled children than for those of controls. Thus, parental self-reports provide a valid index of reading problems. 相似文献
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Sadie Goldsmith 《Journal of Experimental Education》2013,81(4):343-345
Type I error rate and power for the t test, Wilcoxon-Mann-Whitney (U) test, van der Waerden Normal Scores (NS) test, and Welch-Aspin-Satterthwaite (W) test were compared for two independent random samples drawn from nonnormal distributions. Data with varying degrees of skewness (S) and kurtosis (K) were generated using Fleishman's (1978) power function. Five sample size combinations were used with both equal and unequal variances. For nonnormal data with equal variances, the power of the U test exceeded the power of the t test regardless of sample size. When the sample sizes were equal but the variances were unequal, the t test proved to be the most powerful test. When variances and sample sizes were unequal, the W test became the test of choice because it was the only test that maintained its nominal Type I error rate. 相似文献
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Bannatyne's “genetic dyslexic” subtype of reading disability was evaluated using WISC-R data obtained from 140 disabled readers and their matched controls (total N = 280). Although a familial pattern of reading problems was present among the relatives of the disabled readers, it was not unique to the “genetic dyslexic” subtype. However, the predicted Spatial > Conceptual > Sequential pattern of means was found to be reliable and specific to the reading disabled sample. 相似文献
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Previous twin studies have provided evidence for genetic influences on reading disability (RD) or normal reading ability. The existence of subtypes of RD — each with its characteristic cognitive profile — has been suggested. Whether the etiology of the particular subtypes is genetic is uncertain. The present study examined within-pair comparisons of cognitive profiles (with respect to composites of general reading, symbol processing speed and sequential memory) in RD and control twins. Twin profile analysis were applied to these cognitive composites on 120 pairs of RD and control twins. Results showed a greater monozygotic (MZ) than dizygotic (DZ) resemblance in profiles indicating that individual differences in the patterning of cognitive abilities related to reading are genetically influenced. 相似文献
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Sadie N. Decker 《Reading and writing》1989,1(2):123-134
Forty adults who had been diagnosed as reading disabled when they were children and 40 adults from a matched control group of normal readers were tested to assess the diagnostic utility of a newly developed set of tests as well at to ascertain whether or not reading disability persists into early adulthood. The new measures, designed to examine cognitive processing rates in disabled and normal adult readers, included expressive verbal fluency, confrontation naming, and perceptual speed. Evidence for significantly slower cognitive processing rates and persistent problems in reading and spelling was apparent among the young adult disabled readers. Spatial and mathematical ability levels were well within the normal range. 相似文献
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