Related Experiment Video
Updated: Jul 29, 2026

Dithranol as a Matrix for Matrix Assisted Laser Desorption/Ionization Imaging on a Fourier Transform Ion Cyclotron Resonance Mass Spectrometer
Published on: November 26, 2013
Reassessment of factor solution of Halstead's Matrix
Abstract:
Halstead's correlational matrix of 13 neuropsychological tests was reanalyzed with the objective of obtaining a more neuropsychologically meaningful solution. The emphasis was on solving for different numbers of factors (three and five). The three-factor solution supported and perhaps refined two of Halstead's original factors (P and A). The third factor loadings resulted in a considerably different concept that Halstead's D. The three factors (psychological vigilance, abstraction, and perception and memory for incidental stimuli) may be an essential factor pattern in recovery from head traumas. It was concluded that the investigator should not a priori be committed to a structure involving a particular number of factors. Experimentation with factor number or method would allow evaluation of the best psychological fit to the data.
Related Concept Videos
Components of Stress
Interestingly, the hidden cube faces also experience these stresses, equal and opposite to those on the...
Transformation of Plane Stress
Routh-Hurwitz Criterion I
To apply the Routh-Hurwitz criterion, a Routh table is constructed. The table's rows are labeled with powers of the complex frequency variable s, starting from the...
Routh-Hurwitz Criterion II
The first scenario occurs when a singular zero appears in the first column of the Routh table. This situation creates a division by zero issues. To resolve this, a small positive or negative number, denoted as epsilon (∈), is substituted for the zero. The stability analysis proceeds by assuming a sign for ∈. If ∈ is positive, any sign change in the first column of the Routh...
Halo Effect
Gaussian Elimination: Problem Solving

