The accuracy of the Life Orientation Test–Revised (LOT–R) in measuring dispositional optimism was investigated applying item response theory (IRT). The study was conducted on a sample of 484 university students (62% males, M age = 22.79 years, SD = 5.63). After testing the 1-factor structure of the scale, IRT was applied to evaluate the functioning of the LOT–R along the pessimism–optimism continuum. Item parameter estimates and the test information function showed that each item and the global scale satisfactorily measured the latent trait. Referring to the IRT estimated trait levels, the validity of the LOT–R was studied examining the relationships between dispositional optimism and psychological well-being, sense of mastery, and sense of coherence. Overall findings based on IRT analyses provide evidence of the accuracy of the LOT–R and suggest possible modifications of the scale to improve the assessment of dispositional optimism.

The Accuracy of the Life Orientation Test–Revised (LOT–R) in Measuring Dispositional Optimism: Evidence From Item Response Theory Analyses / Francesca Chiesi;Silvia Galli;Caterina Primi;Paolo Innocenti Borgi;Andrea Bonacchi. - In: JOURNAL OF PERSONALITY ASSESSMENT. - ISSN 0022-3891. - STAMPA. - 95:(2013), pp. 523-529. [10.1080/00223891.2013.781029]

The Accuracy of the Life Orientation Test–Revised (LOT–R) in Measuring Dispositional Optimism: Evidence From Item Response Theory Analyses

CHIESI, FRANCESCA;GALLI, SILVIA;PRIMI, CATERINA;BONACCHI, ANDREA
2013

Abstract

The accuracy of the Life Orientation Test–Revised (LOT–R) in measuring dispositional optimism was investigated applying item response theory (IRT). The study was conducted on a sample of 484 university students (62% males, M age = 22.79 years, SD = 5.63). After testing the 1-factor structure of the scale, IRT was applied to evaluate the functioning of the LOT–R along the pessimism–optimism continuum. Item parameter estimates and the test information function showed that each item and the global scale satisfactorily measured the latent trait. Referring to the IRT estimated trait levels, the validity of the LOT–R was studied examining the relationships between dispositional optimism and psychological well-being, sense of mastery, and sense of coherence. Overall findings based on IRT analyses provide evidence of the accuracy of the LOT–R and suggest possible modifications of the scale to improve the assessment of dispositional optimism.
2013
95
523
529
Francesca Chiesi;Silvia Galli;Caterina Primi;Paolo Innocenti Borgi;Andrea Bonacchi
File in questo prodotto:
File Dimensione Formato  
LOT_JPA.pdf

Accesso chiuso

Tipologia: Versione finale referata (Postprint, Accepted manuscript)
Licenza: DRM non definito
Dimensione 337.92 kB
Formato Adobe PDF
337.92 kB Adobe PDF   Richiedi una copia

I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/810081
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 69
  • ???jsp.display-item.citation.isi??? 61
social impact