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A nonparametric, small-sample-size test for the homogeneity of two psychometric functions against the left- and right-shift alternatives has been developed. The test is designed to determine whether it is safe to amalgamate psychometric functions obtained in different experimental sessions. The sum of the lower and upper p-values of the exact (conditional) Fisher test for several 2 × 2 contingency tables (one for each point of the psychometric function) is employed as the test statistic. The probability distribution of the statistic under the null (homogeneity) hypothesis is evaluated to obtain corresponding p-values. Power functions of the test have been computed by randomly generating samples from Weibull psychometric functions. The test is free of any assumptions about the shape of the psychometric function; it requires only that all observations are statistically independent.
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http://dx.doi.org/10.3758/s13428-011-0155-z | DOI Listing |
J Pharm Policy Pract
September 2025
Division of Social and Administrative Pharmacy, Faculty of Pharmaceutical Sciences, Burapha University, Chonburi, Thailand.
Background: Although the 12-item Short Form Health Survey version 2 (SF-12v2) is suitable for measuring health status in the general Thai population, it has been evaluated using classical test theory. Rasch analysis, however, offers a psychometric testing method that converts ordinal scales to interval-level data without breaching parametric assumptions. Thus, this study aimed to assess the measurement properties of Thai SF-12v2 and SF-6D items derived from it among the general Thai population.
View Article and Find Full Text PDFJ Lat Psychol
July 2025
Population Research Center, University of Texas at Austin, College of Liberal Arts, 305 E. 23rd Street, Austin, TX, 78712.
The present study had two aims: (a) to take a person-centered approach and identify profiles of assets that include active coping, bicultural competency, and preparation for bias, among Latinx adolescents, and (b) examine the relations between asset profiles and Latinx adolescents' school functioning and mental health. The present study used cross-sectional data from 201 middle school students ( = 12.35, = 1.
View Article and Find Full Text PDFAlpha Psychiatry
August 2025
Department of Addictology, 1st Faculty of Medicine, Charles University and General University Hospital in Prague, 128 00 Prague, Czech Republic.
Objective: Information about the level of general personality functioning could provide benefits for tailoring substance use disorder (SUD) treatment. This study examined self-reported personality functioning among patients with SUD compared to the general population, gender specifics, and the psychometric properties of the Czech Level of Personality Functioning Scale-Self Report (LPFS-SR).
Methods: Two samples were used in this study.
Aerosp Med Hum Perform
September 2025
Introduction: There has been long-standing interest in the physiological and psychological effects of mild hypoxia on aircrew, but to date there is no psychometrically valid self-report measure of subjective symptoms.
Methods: To address this gap, we developed a self-report scale along three dimensions of impairment: cognitive, sensory and affective. We administered this scale to active and retired aircrew (N = 354) with on average 25.