Correlations of scores on the Wechsler Intelligence Scale for Children and the Peabody Picture Vocabulary Test for adolescents in a special educational program

The Wechsler Intelligence Scale for Children and the Peabody Picture Vocabulary Test were administered to 159 socio-economically deprived Negro adolescents who had been placed in a special educational setting. Ages ranged from 12 to 15 yr., with a mean age of 138 yr. The Wechsler mean Full Scale IQ was 72.4 with a standard deviation of 9.8. Analyses yielded no significant differences between the Verbal and Performance sections of the Wechsler scale and there were no distinctive Wechsler subtest profiles discernible. Inter-correlations of the Wechsler subtests were similar to those reported in the Wechsler manual. While the obtained mean Peabody IQ closely approximated the mean Wechsler IQ, intercorrelations between the Peabody IQ and the Wechsler Full Scale, the Wechsler Verbal, and the Wechsler Performance IQs were relatively low. A statistical test showed a clear cumulative age deficit.

Intelligibility of connected discourse

An approach to measuring the intelligibility of free-running connected discourse that contrasts with the quasi-statistical methods generally used with nonsense syllables, words, or sentences is described. With this approach, intelligibility is viewed as a decision by the listener that specifies how well the message was understood. The goal of testing, therefore, is to quantify the listener’s response with meaningful indices of performance. The various speech-Bekesy procedures are sensitive to a listener decision, but they fail to specify how the criterion of intelligibility was interpreted by the listener and have the additional disadvantage of specifying intelligibility as a threshold level in decibels rather than as a magnitude of intelligibility in percent. Experiments are reported in which systematic modifications were made to the speech-Bekesy procedures. The two major methods are “tracking to constant percentage criteria of intelligibility” and “estimation of intelligibility.” The results specify intelligibility of connected discourse by a performance-intensity function. The data are stable across alternative testing methods and compare favorably with sentence-repetition scores.

Image Analysis Illustrated With A Spearman Case

Because one can write the inverse of the correlation matrix in an extremely simple fashion when the variables form a perfect Spearman case, it is possible to use such a case to illustrate some well-known princeples in component and factor analysis.

"Fixed" splitting of the second heart sound in ventricular septal defect

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Genetic control of lactate dehydrogenase formation in the hagfish Eptatretus stoutii

The isozyme patterns of lactate dehydrogenases of various tissues were studied on 51 hagfish by starch-gel electrophoresis. Nine lactate dehydrogenase phenotypes were encountered, suggesting the coexistence of two alleles at each of the two separate gene loci. There apparently was no interaction between the products of these two separate loci. Even the products of two alleles at the same locus were apparently incapable of forming hybrid molecules, an indication of the possible monomeric nature of each lactate dehydrogenase molecule.