Poster
Reference
Analysis of the French WISC-IV index score scatter and level of performance with gifted and non gifted children
LECERF, Thierry, et al.
LECERF, Thierry, et al. Analysis of the French WISC-IV index score scatter and level of
performance with gifted and non gifted children. In: The 8th Conference of the International Test Commission, Amsterdam, July 3-5, 2012, 2012
Available at:
http://archive-ouverte.unige.ch/unige:25988
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Analysis of the French WISC-IV index score scatter and level of performance with gifted and non gifted children 1
T. Lecerf*, I. Reverte*, S. Kieng*, N. Favez*, J. Rossier
#& N. Scherrer*
* Faculty of Psychology and Educational Sciences, University of Geneva, and # University of Lausanne, Switzerland
INTRODUCTION
OBJECTIVE
CONCLUSIONS RESULTS
The 8th Conference of the International Test Commission, 2012, Amsterdam ; Contact: thierry.lecerf@unige.ch
q The WISC-IV is one of the most appropriate IQ tests for identifying children who are intellectually gifted.
q While the FSIQ is useful in the assessment and the classification of intellectually gifted children, the index scores allow for a better understanding of the child functioning, the learning profile.
q However, some authors suggested that subtest scatter
invalidates the FSIQ, and that scatter was higher for gifted children than for non gifted children; thus, scatter analysis should be considered.
q Some studies have shown that CHC-based model better fits
the WISC-IV than the current four-factor index, thus, five CHC composite scores were calculated (Gf, Gc, Gv, Gsm, and Gs).
1) Level of performance (Bonferroni correction)
2) Index score scatter (Bonferroni correction)
3) Index score discrepancies (Bonferroni correction)
4) Discrepancies between index and average index score
• The main objective was to compare gifted and non-gifted children for :
1. Mean level of performance : standard and CHC scores
• Gifted > non-gifted for VCI, PRI, Gc, Gf, and Gv
• Gifted = non-gifted for WMI, PSI, Gsm, and Gs
2. Index score scatter (variability) : standard and CHC scores
• Scatter higher for gifted than for non-gifted children
3. Index score discrepancies : standard and CHC scores
• Performances between index scores are more heterogeneous for gifted than for non gifted children.
1. Gifted children performed better than non-gifted for all
composite scores, except for Gv (with Bonferroni correction).
2. Gifted and non gifted children display similar scatter; Index score scatter was not higher for gifted than for non gifted.
3. Only discrepancy between Gc and Gv was higher for gifted children than for non gifted children.
4. Gifted children demonstrated a higher dispersion of VCI or Gc around the mean index score (ipsative strength).
• In sum, Gifted children demonstrated better performance than non gifted children but scatter was similar for both
groups. Gifted children are not more heterogeneous than non gifted children.
• Subtest scatter does not invalidate FSIQ more frequently for gifted than for non gifted children.
1 This work was supported by Grant 100014_118248 from the Swiss National Science Foundation
METHOD Samples
• 25 gifted children (13 boys, age = 10.29 years; FSIQ = 128.68, SD = 5.19)
• 25 non-gifted children (13 boys, age = 10.29 years; FSIQ = 104.00, SD = 6.38)
• Gifted and non gifted were matched for age, sex, and
socioeconomic status. Children were aged from 8 to 12 years.
Material
• All subtests of the WISC-IV (10 core and 5 optional) were administered to all children.
• Standard indexes : Verbal Comprehension (VCI), Perceptual
Reasoning (PRI), Processing speed (PSI), Working memory (WMI), and Full Scale Intelligence Quotient (FSIQ).
• Five CHC composite scores: Comprehension-Knowledge (Gc:
Similarities + Comprehension), Fluid reasoning (Gf: Picture Concepts + Matrix Reasoning), Visual Processing (Gv: Block Design + Picture
completion), Short-term memory (Gsm: Digit Span + Letter-Number Sequence) and Processing Speed (Gs: Coding + Symbols Search).
Scatter analysis
• Index score scatter : difference between the highest and the lowest subtest score within each index score
• Index score discrepancies : all pairwise comparisons with Bonferroni correction (VCI vs. PRI, etc.)
• Difference between each index score and the mean index score
0 1 2 3 4 5 6 7
VCI-diff PRI-diff WMI-diff PSI-diff Gf_diff Gc-diff Gv-diff Gsm-diff Gs-diff
Gifted Non gifted
0 10 20 30 40 50
VCI-PRI VCI-PSI VCI-WMI PRI-PSI PRI-WMI PSI-WMI Gf-Gc Gf-Gv Gf-Gsm Gf-Gs Gc-Gv Gc-Gsm Gc-Gs Gv-Gsm Gv-Gs Gsm-Gs
Gifted Non gifted
*
0 5 10 15 20 25 30
VCI-Mean PRI-Mean WMI-Mean PSI-Mean Gf-Mean Gc-Mean Gv-Mean Gsm-Mean Gs-Mean
Gifted Non gifted
* *
60 70 80 90 100 110 120 130 140 150
VCI PRI WMI PSI FSIQ Gf Gc Gv Gsm Gs
Gifted Non gifted
