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9 Cards in this Set

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refers to the accuracy, consistency and stability of test scores across situations. A reliable test has relatively small measurement error and produces consistent measurement results within on administration and on different occasions.
WAIS IV Index Reliability Avg from ages 16-90
VCI - .96, PRI - .95, WMI - .94, PSI - .90. Obtained using split-half and Cronbach's coefficient alpha methods.PSI used test-retest stability coefficients. Reliability of retained WAIS III subtests were comparable or improved. Realibility of two new PRI subtests, Visual Puzzles and Figure Weights are generally higher than WAIS III Perceptual Organization subtests. Reliability for special pops including Intellectually Gifted, Intellectually Disability- Mild Severity, Intenllecutally Disabled-Moderate Severity, Borderline Intellectuall Functioning, Reading Disorder, Mathematics Disorder, ADHD, Traumatic Brain Injury, Autistic Disorder, Asperger's Disorder, Major Depressive Disorder, Mild Cognitive Impairment, and Probable Dementia of Alzheimer's Type-Mild Severity is supported by the instrument's generalizability.
Three major types; Content, Criterion-related, and construct validity.
Content Validity
Content validity if it adequately sampled relevant aspects of construct being tested. efers to the extent to which a measure represents all facets of a given social construct. For example, a depression scale may lack content validity if it only assesses the affective dimension of depression but fails to take into account the behavioral dimension.
Criterion-related Validity
is used to demonstrate the accuracy of a measure or procedure by comparing it with another measure or procedure which has been demonstrated to be valid.
Construct Validity
When the construct that is to be measured by the test is actually measured.
WAIS IV Reliability Streamlined
Too early to be able to measure long-term stability of scores of persons being retested. Short-term stability coefficients for all subtests at all ages ranged from .71(adequate) to .90 (reliable) For core subtests, short-term stability coefficients were .74 to .90 with a median of .82 (Essentials - Lichtenberger & Kaufman 2009)
WAIS IV Evidence of Validity
Validity evidence from comparisons with tests of cognitive abilities and test of academic achievement supports the use of the WAIS-IV for cognitive assessment and prediction of achievement.
WAIS IV Evidence of Validity with Special Groups
Not normed on individuals with sever disabilities or disabilities.