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. 2019 Jul;24(8):1070-1081.
doi: 10.1177/1359105316689603. Epub 2017 Jan 30.

Rasch analysis of the Perceived Stress Scale: Transformation from an ordinal to a linear measure

Oleg N Medvedev  1 , Christian U Krägeloh  1 , Erin M Hill  2 , Rex Billington  1 , Richard J Siegert  1 , Craig S Webster  3 , Roger J Booth  3 , Marcus A Henning  3
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Rasch analysis of the Perceived Stress Scale: Transformation from an ordinal to a linear measure

Oleg N Medvedev et al. J Health Psychol. 2019 Jul.

Abstract

Rasch analysis was conducted to enhance the precision of the widely used 10-item Perceived Stress Scale using two datasets (n = 450 each) randomly selected from samples of the New Zealand general population (n = 1102), New Zealand university students (n = 479) and US university students (n = 396). The best Rasch model fit (χ2(27) = 29.92, p = .36), good person separation reliability (.80) and coverage (98%) of the sample by the scale items were achieved when locally dependent items were combined into subtests. These findings support reliability and internal structural validity of the 10-item Perceived Stress Scale. The instrument precision can be further improved using the ordinal-to-linear conversion tables published here.

Keywords: Perceived Stress Scale; Rasch analysis; measurement; psychometrics; stress.

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