Enhancing the Precision of the Revised Life Orientation Test (LOT-R) across Germany, Ghana, India, and New Zealand Using Rasch Methodology

Peter Adu (), Tosin Popoola (), Emerson Bartholomew (), Naved Iqbal (), Oleg N. Medvedev () and Colin R. Simpson ()
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Peter Adu: Victoria University of Wellington
Tosin Popoola: The University of Newcastle
Emerson Bartholomew: University of Auckland
Naved Iqbal: Jamia Millia Islamia
Oleg N. Medvedev: University of Waikato
Colin R. Simpson: Victoria University of Wellington

Social Indicators Research: An International and Interdisciplinary Journal for Quality-of-Life Measurement, 2025, vol. 179, issue 1, No 19, 505-525

Abstract: Abstract Accurately measuring life orientation (or continuum from optimism to pessimism) is essential for research focused on enhancing health and well-being. The psychometric statistics of the Revised Life Orientation Test (LOT-R) has been examined using Classical Test Theory (CTT). This method has been criticized for relying on the imprecise ordinal scores. We have employed the advance Rasch methodology to examine the psychometric statistics of the Revised Life LOT-R within a community sample from Ghana, Germany, India, and New Zealand. Utilizing the Partial Credit Rasch model, we analyzed responses from a randomly selected sample of 1,000 individuals (n= 250 from each country) out of the total sample of 1,822 recruited from these countries. Our initial analysis of the LOT-R revealed significant misfit to the unidimensional Rasch model (χ2 (24) = 93.38, p

Keywords: Dispositional Optimism; Rasch Methodology; Life Orientation Test; Validation; Reliability; Psychometrics (search for similar items in EconPapers)
Date: 2025
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DOI: 10.1007/s11205-025-03613-x

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