Factorial Validity, Reliability, Measurement Invariance and the Graded Response Model for the COVID-19 Anxiety Scale in a Sample of Ecuadorians

Rodrigo Moreta-Herrera, Tomás Caycho-Rodríguez, Alexandra Salinas, Micaela Jiménez-Borja, Daniel Gavilanes-Gómez, Carlos José Jiménez-Mosquera

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The aims of the research are to evaluate the factorial validity, internal consistency, measurement invariance, discrimination, and difficulty of the Covid-19 Anxiety Scale (CAS) applied to a sample of Ecuadorian adults (N = 451). The study is based on an instrumental design with Classical Test Theory (CTT) and Item Response Theory (IRT) technics. The results confirmed the validity of the CAS single-factor structure, with measurement invariance across gender and high internal consistency. Additionally, all CAS items displayed adequate discrimination indexes and proper ordering of the difficulty thresholds. In a conclusion, the CAS is a valid measurement scale for Ecuadorian adults.

Original languageEnglish
JournalOmega (United States)
DOIs
StateAccepted/In press - 2022
Externally publishedYes

Keywords

  • Covid-19
  • anxiety
  • difficulty
  • discrimination
  • reliability
  • scale validity

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