IQ estimate smackdown: Comparing IQ proxy measures to the WAIS-III

AbstractBrief assessments of general cognitive ability are frequently needed by neuropsychologists, and many methods of estimating intelligence quotient (IQ) have been published. While these measures typically present overall correlations with the Wechsler Adult Intelligence Scale (WAIS) Full Scale IQ, it is tacitly acknowledged that these estimates are most accurate within 1 standard deviation of the mean and that accuracy diminishes moving toward the tails of the IQ distribution. However, little work has been done to systematically characterize proxy measures at the tails of the IQ distribution. Additionally, while these measures are all correlated with the WAIS, multiple proxy measures are rarely presented in one manuscript. The current article has two goals: (1) Examine various IQ proxies against Wechsler Adult Intelligence Scale (Third Version) scores, showing the overall accuracy of each measure against the gold standard IQ measure. This comparison will assist in selecting the best proxy measure for particular clinical constraints. (2) The sample is then divided into three groups (below, average, and above-average ability), and each group is analyzed separately to characterize proxy performance at the tails of the IQ distribution. Repeated measures multivariate analysis of variance compares the different proxy measures across ability levels. All IQ estimates are represented in tables so that they can be examined side by side. (JINS, 2009, 15, 590–596.)

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Retest Reliability of the Wechsler Adult Intelligence Scale-Revised for 18- to 19-Year-Olds

Psychological Reports ◽

10.2466/pr0.1996.78.1.211 ◽

1996 ◽

Vol 78 (1) ◽

pp. 211-214 ◽

Cited By ~ 1

Author(s):

Howard Carvajal ◽

Matthew S. Schrader ◽

Cooper B. Holmes

Keyword(s):

Age Groups ◽

Adult Intelligence Scale ◽

Intelligence Scale ◽

Retest Reliability ◽

Wechsler Adult Intelligence Scale ◽

Adult Intelligence ◽

The Mean ◽

Wechsler Adult Intelligence ◽

Two Age Groups

Retest reliability of the WAIS-R for 18- to 19-yr.-olds was estimated for 44 undergraduates who took the test twice with 2 to 8 weeks between testings. The mean scores on subtests and IQs and the correlations of subtest scores and IQs were similar to the values obtained by Wechsler in 1981 with only two age groups, 25- to 34- and 45- to 54-yr.-old examinees.

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Auditory and Visual Recall of Forward and Backward Digit Spans

Perceptual and Motor Skills ◽

10.2466/pms.1996.82.3c.1099 ◽

1996 ◽

Vol 82 (3_suppl) ◽

pp. 1099-1103 ◽

Cited By ~ 12

Author(s):

Douglas H. Powell ◽

Mark D. Hiatt

Keyword(s):

Cognitive Functioning ◽

Digit Span ◽

Visual Presentation ◽

Auditory Presentation ◽

Adult Intelligence Scale ◽

Intelligence Scale ◽

Wechsler Adult Intelligence Scale ◽

Adult Intelligence ◽

The Mean ◽

Wechsler Adult Intelligence

Increasingly, clinicians obtain data from tests across modalities. Little actual information, however, exists as to normal patterns. An example is auditory and visual recall of digit span. The effects of modality on recall of digit span, sequence, and order were examined with 80 subjects ( M age 24.3 yr.). Subjects were given the Wechsler Adult Intelligence Scale-Revised, and a research version of MicroCog: Assessment of Cognitive Functioning. Both contain forward and backward digit spans. Recall for visual presentation was significantly stronger than for auditory presentation of backward digit span. Recall for visual backward digit span was also superior to auditory backward digit span when the sequence of presentation was controlled. The mean number of digits recalled was higher when visual digit span was preceded by auditory digit span.

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Comparison of the Stanford-Binet with the Wechsler Adult Intelligence Scale—Revised: Preliminary Report

Psychological Reports ◽

10.2466/pr0.1985.57.1.335 ◽

1985 ◽

Vol 57 (1) ◽

pp. 335-336

Author(s):

Donald I. Templer ◽

Stephen P. Schmitz ◽

Mark D. Corgiat

Keyword(s):

Graduate Students ◽

Clinical Psychology ◽

Preliminary Report ◽

Adult Intelligence Scale ◽

Intelligence Scale ◽

Wechsler Adult Intelligence Scale ◽

Adult Intelligence ◽

The Mean ◽

Wechsler Adult Intelligence

Mean WAIS-R IQ was 13.80 points lower than the mean Stanford-Binet IQ for 15 adults tested by 15 graduate students in clinical psychology. This finding was discussed in the context of studies which show WAIS-R IQ to be appreciably lower than WAIS IQ.

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Geschlechtseffekte bei Intelligenz- und Gedächtnisleistungen

Zeitschrift für Neuropsychologie ◽

10.1024/1016-264x/a000144 ◽

2015 ◽

Vol 26 (1) ◽

pp. 5-16 ◽

Cited By ~ 3

Author(s):

Anja C. Lepach ◽

Wiebke Reimers ◽

Franz Pauls ◽

Franz Petermann ◽

Monika Daseking

Keyword(s):

Adult Intelligence Scale ◽

Intelligence Scale ◽

Wechsler Adult Intelligence Scale ◽

Adult Intelligence ◽

Wechsler Memory Scale ◽

Wechsler Adult Intelligence

Diese Studie untersucht die Zusammenhänge von Intelligenz- und Gedächtnisleistungen in der Wechsler Adult Intelligence Scale-IV und der Wechsler Memory Scale-IV unter Berücksichtigung des Geschlechts (N = 137 Gesunde, 63 w/74 m). Ein Vorteil der weiblichen Testpersonen im verbalen episodischen Gedächtnis sowie in einzelnen Aufgaben zur Verarbeitungsgeschwindigkeit konnte beobachtet werden. Die männlichen Testpersonen schnitten in den Untertests Allgemeines Wissen und Visuelle Puzzles besser ab. Wie gut Gedächtnisleistungen Intelligenzleistungen erklären beziehungsweise vorhersagen, ist aufgrund unserer Ergebnisse nicht nur abhängig von den Aufgaben, sondern auch vom Geschlecht.

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Analyse von Querschnittsdaten zur Intelligenzentwicklung im Erwachsenenalter: eine Studie zur deutschsprachigen Version der WAIS-IV

Zeitschrift für Neuropsychologie ◽

10.1024/1016-264x/a000098 ◽

2013 ◽

Vol 24 (3) ◽

pp. 149-160 ◽

Cited By ~ 10

Author(s):

Monika Daseking ◽

Franz Petermann

Keyword(s):

Fourth Edition ◽

Adult Intelligence Scale ◽

Intelligence Scale ◽

Wechsler Adult Intelligence Scale ◽

Adult Intelligence ◽

Wechsler Adult Intelligence ◽

Deutschsprachige Version

Im vorliegenden Beitrag wird der Datensatz (N = 1664), aus dem auch die Normstichprobe für die deutschsprachige Version der Wechsler Adult Intelligence Scale – Fourth Edition (WAIS-IV) gezogen wurde, nach altersabhängigen Veränderungen kognitiver Fähigkeiten analysiert. Die niedrigsten Rohwertmittelwerte werden in der ältesten Altersgruppe erreicht, die Leistungsspitzen finden sich überwiegend im Altersbereich zwischen 20 und 29 Jahren. In den Untertests der Indizes Wahrnehmungsgebundenes Logisches Denken und Verarbeitungsgeschwindigkeit kommt es zu einer bedeutsamen Leistungsabnahme mit zunehmendem Alter: In der ältesten Altersgruppe werden nur noch zwischen 50 und 60 % der Rohwertmittelwerte der leistungsstärksten Altersgruppe erreicht. Gleichzeitig nimmt die Heterogenität in der Rohwertverteilung zu. Für die Indizes Sprachverständnis und Arbeitsgedächtnis fallen beide Effekte deutlich niedriger aus.

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