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Monday, April 26, 2010


Principal Components Factor analysis for the JCTI and SAT relationshipA principal components factor analysis has been performed with the data collected from 85 out of 119 persons, takers of the Jouve-Cerebrals Test of Induction (JCTI), whom reported previously obtained Scholastic Assessment Test-Recentered (SAT-I) scores. Individuals with perfect scores on the Mathematical and/or the Verbal part of the SAT-I were discarded in order to avoid ceiling [...]2-Parameters Logistic Model Item Characteristic Curves for the Cerebrals Contest 2009I’ve finally found the time today to report the characteristic curves for the Cerebrals Contest 2009 using the 2-Parameters Logistic Model.
Which Word? questions number 2, 4 and 7 didn’t show an appropriate response function.
Download here (pdf)
Hierarchical Ascendant Classification of the EPC and the Scholastic Assessment Test-Recentered reasoning scalesI’ve focused my energy on the JCCES – RIAS relationship those days. By the way, I’m still in the process of arranging research data on the revision of the Epreuve de Performance Cognitive (EPC) for completing the submission of this project to the test publisher.

In order to study the relationship between the EPC-Revised and the Scholastic Assessment Test-Recentered [...]On the relationship between the JCCES and the Reynolds Intellectual Assessment Verbal Scale (Part 4)Here are the results of a Hierarchical Ascendant Classification (HAC) analysis for the T-scores of the JCCES subtests and the RIAS verbal subtests.

This cluster analysis used the Ward’s method based on Chebyshev’s distance. As shown in Figure 1, the dendogram revealed two distinct groups into the principal one: (1) a group with emphasis on reasoning [...]Correlations between the JCCES and other measuresHere are the correlations that were observed between the Jouve-Cerebrals Crystallized Educational Scale (JCCES) and other measures of cognitive abilities or achievement.

Be aware that the correlations related to the RIAS GWH and VRZ are not comparable to those provided in the JCCES - RIAS relationship posts which were not corrected for restriction of range. Moreover, these values of [...]On the relationship between the JCCES and the Reynolds Intellectual Assessment Verbal Scale (Part 3)Mean and SD for the JCCES and RIAS scores are given in the table below.

As can be seen in Figures 1, 2, 3 and 4, the examination of observed correspondences between JCCES and RIAS scores indicate a high degree of similarity in ability levels up to approximately 1.5 SD above the general population average. The JCCES [...]On the relationship between the JCCES and the Reynolds Intellectual Assessment Verbal Scale (Part 2)Both the JCCES and the verbal RIAS have been observed to yield very closely related measures. However, although the two batteries gave comparable scores within an interval from about 1 SD below the mean to about 1.5 SD above, the results no longer compare appropriately in adult examinees with high abilities. The RIAS Verbal Intelligence [...]Understanding Wechsler IQ score differencesAn excellent read.
AP101 Brief #6: Understanding Wechsler IQ score differences–the CHC evolution of the Wechsler FS IQ score
On the relationship between the JCCES and the Reynolds Intellectual Assessment Verbal Scale (Part 1)The relationship between the JCCES and the two-subtest verbal part of the Reynolds Intellectual Assessment Scale (RIAS) has been analyzed in order to investigate the criterion-related validity of the JCCES. A group of 119 examinees have participated. In this first part of the study, a principal components factor analysis conducted on the three subtests of the JCCES [...]Principal Components Factor analysis for the items of the JCCES Verbal Ability partIn an attempt to study the structure of the Verbal Ability scale of the JCCES, I’ve factor analyzed the items of both the Verbal Analogies (VA) subtest and the General Knowledge (GK) subtest all at once. Factor analysis is a common method of examining the patterns of relationships among a set of variables and is [...]

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