Related Experiment Video
Updated: Mar 17, 2026
16:34
Laser Capture Microdissection of Mammalian Tissue
Published on: October 1, 2007
17.6K
Generally representative is generally representative: comment on Shuttleworth-Edwards
1a JvR Psychometrics , Johannesburg , South Africa.
The Clinical Neuropsychologist
|July 30, 2016
Summary
This study discusses the general population norms for the South African adaptation of the WAIS-IV. It argues against discarding these norms without evidence of misclassification, emphasizing their importance for clinical diagnosis.
Area of Science:
- Psychometrics
- Neuropsychological Assessment
Background:
- Critique of general population norms for the South African adaptation of the WAIS-IV.
- Concerns raised regarding norm applicability due to lack of stratification by education quality.
Purpose of the Study:
- To comment on criticism regarding WAIS-IV general population norms in South Africa.
- To discuss factors influencing the creation of general population norms in the South African context.
Main Methods:
- Discussion of key issues in creating general population norms.
- Consideration of demographic factors: education level, education quality, urban/rural, home language.
Main Results:
- Utility of within-group norms is acknowledged but not advised without reference to general population norms.
- Dispensing with general population norms without evidence of misclassification lacks scientific merit.
Conclusions:
- Clinical studies and predictive validity research are crucial for the WAIS-IV in South Africa.
- Additional reference groups can enhance diagnostic information, but general norms are a vital starting point.
Related Concept Videos
02:13The Representativeness Heuristic
17.0K
The representative heuristic describes a biased way of thinking, in which you unintentionally stereotype someone or something. For example, you may assume that your professors spend their free time reading books and engaging in intellectual conversation, because the idea of them spending their time playing volleyball or visiting an amusement park does not fit in with your stereotypes of professors.
17.0K
01:34Woodward–Hoffmann Selection Rules and Microscopic Reversibility
4.1K
Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
4.1K
01:25Eddy Currents
2.9K
Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
2.9K
01:16Stratified Sampling Method
16.0K
Sampling is a technique to select a portion (or subset) of the larger population and study that portion (the sample) to gain information about the population. The sampling method ensures that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest.
To choose a stratified sample, divide the population into groups called strata and then take a...
To choose a stratified sample, divide the population into groups called strata and then take a...
16.0K
01:17Systematic Sampling Method
13.7K
Sampling is a technique to select a portion (or subset) of the larger population and study that portion (the sample) to gain information about the population. Data are the result of sampling from a population. The sampling method ensures that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest.
Systematic sampling is one of the simplest methods...
Systematic sampling is one of the simplest methods...
13.7K
02:03Law of Independent Assortment
64.1K
While Mendel’s Law of Segregation states that the two alleles for one gene are separated into different gametes, a different question of how different genes are inherited remains. For example, is the gene for tall plants inherited with the gene for green peas? Mendel asked this question by experimenting with a dihybrid cross; a cross in which both parents are homozygous for two distinct traits resulting in an F1 generation that are heterozygous for both traits.
64.1K