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

Author

Listed:
  • Peter Adu

    (Victoria University of Wellington
    McGill University)

  • 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
    Usher Institute, The University of Edinburgh)

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

Suggested Citation

  • Peter Adu & Tosin Popoola & Emerson Bartholomew & Naved Iqbal & Oleg N. Medvedev & Colin R. Simpson, 2025. "Enhancing the Precision of the Revised Life Orientation Test (LOT-R) across Germany, Ghana, India, and New Zealand Using Rasch Methodology," Social Indicators Research: An International and Interdisciplinary Journal for Quality-of-Life Measurement, Springer, vol. 179(1), pages 505-525, August.
    • Handle: RePEc:spr:soinre:v:179:y:2025:i:1:d:10.1007_s11205-025-03613-x
    DOI: 10.1007/s11205-025-03613-x
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