#WAIS IV CUT SCORES MANUAL#
#WAIS IV CUT SCORES PROFESSIONAL#

IQ-IQ score differences: Scientific hypotheses that warrant exploration touch, the difference is likely a different from reliable difference and one another hypotheses about the difference should be enteratined If 95 % SEM confidence bands for compared scores overlap, then the difference is likely not a reliable difference and should not generate significant hypotheses about score differences. other e.g., None of If 95 % SEM confidence bands these 6 tests for compared scores do not are sign. to accept different and to from each explain why. 93 1 SEdiff (68 % confidence) = 5.2 points 2 SEdiff (95 % confidence) = 10.4 pointsBefore interpreting the scores from these two IQ tests as being significantly difference, an IQ-IQ difference of at least 10+ points would be required Easier way via use of confidence band rule-of-thumbД®.g., WAIS-R score The higherThe standard error of differences represent the difference (SEdiff) WAIS-R reliable differences withconfidence band rule- all other obtained IQ scores is a of-thumb scores scientifically based fact in this case. The standard error of the difference (SEdiff) must be used to ascertain if the scores in question are reliably different SEdiff = 15 x SQRT Test A reliability =. 80 common abilities Test B вЂњpsychologists can anticipate that 1 in 4 individuals taking an intelligence test battery will receive an IQ more than 10 points higher or lower when taking another batteryвЂќFloyd et al. 80 common abilities Test BДЇundamental Issue: Comparability of IQ Scores Test A Shared. 80Coefficient of determination r2 x 100 = 64 % shared variance Test A Shared. (2008) used generalizability theory methods to evaluate IQ-IQ exchangeability across ten different IQ battery global composite g-score composites (comprised of 6 to 14 individual tests) acrossapproximately 1,000 subjectsДЇundamental Issue: Comparability of IQ Scores Average (mdn) r =. 38) The global (full scale) IQ from different tests are frequently similarвЂ¦Other times the IQ scores will be markedly differentвЂ¦a finding that often produces consternation for examiners and recipients of psychological reportsДЇundamental Issue: Comparability of IQ ScoresFloyd et al.

#WAIS IV CUT SCORES MANUAL#

Widaman AAIDD Death Penalty Manual Chapter (in preparation)ДЇundamental Issue: Comparability of IQ Scores вЂњNot all scores obtained on intelligence tests given to the same person will be identicalвЂќ (AAIDD, 2010, p. The median is Strong acceptable, under certain convergence circumstances of indicators The only way to compute an average (mean) IQ score is to use a complex equation that incorporates the reliabilities of all scores and the intercorrelations among all scores Median is acceptable metricДЇundamental Issue: Comparability (Exchangeability) of IQ ScoresIntellectual Functioning: Conceptual Issues Kevin S. Median of all = 68 It is statistically or mathematically inappropriate to compute the arithmetic average (mean) of IQ scores.

#WAIS IV CUT SCORES PROFESSIONAL#

вЂњOutliersвЂќ вЂ“ why?State expert built argument around theWAIS-R scores being the best estimates ofdefendants true intelligence (underlyingвЂњYou canвЂ™t fake badвЂќ strategy ) anddismissed other scores as most likely due tomalingering-arguments not based onsound and reliable methods of scienceState expert failed in professional duediligence to consider scientific basedexplanations of the consistencies andinconsistencies in the complete collectionof scores IQ Score Interpretations in Atkins CasesA recently successful Atkins case (state agreed to LWOP a few weeks prior to evidentiary hearing) is bases of presentation but will be augmented with information from other casesД¬ase involved the Flynn Effect:But we will not be covering todayRecommended article (more at ICDP blog) ICDP

ДЇor additional information and to stay current (ICDP blog).

McGrew, PhD Director Institute for Applied Psychometrics (IAP)ДЄdditional info re:Kevin McGrew and IAP can be found at theMindHubв„ў web portal IQ Score Interpretations in Atkins Cases Kevin S. IQ Score Interpretation in Atkins MR/ID Death Penalty Cases: The Good, Bad and the Ugly

Wais iv cut scores