Invariance of factor structure of the 21-item Peters et al. Delusions Inventory (PDI-21) over time and across samples

No Thumbnail Available
File version
Author(s)
Wang, YY
Shi, HS
Liu, WH
Yan, C
Wang, Y
Chiu, CD
So, SH
Lui, SSY
Cheung, EFC
Chan, RCK
Griffith University Author(s)
Primary Supervisor
Other Supervisors
Editor(s)
Date
2017
Size
File type(s)
Location
License
Abstract

The present study aimed to explore the latent structure of the 21-item Peters et al. Delusions Inventory (PDI-21) and to test the invariance of its factor structure over time and across samples. The PDI-21 was administered in two samples; one consisting of 1655 undergraduate students investigated in three waves, each separated by six months; and another consisting of 196 outpatients with schizophrenia. Exploratory factor analysis was performed to explore the internal structure of the PDI-21 based on number of beliefs and the grand total scores separately. The number of factors was determined by optimal implementation of parallel analysis. Confirmatory factor analysis, cross-time and cross-sample invariance analyses were carried out with Mplus. Both exploratory factor analysis and the optimal implementation of parallel analysis (based on the number of beliefs and the total score of the PDI-21) suggested a one-factor solution. However, the confirmatory factor analysis revealed a single-dimension structure based on number of beliefs only, which exhibited goodness of fit and stability across time and samples. Our study demonstrated a single-dimension structure of the PDI-21, which can be widely used in screening the number of delusional ideations both in clinical and non-clinical populations.

Journal Title

Psychiatry Research

Conference Title
Book Title
Edition
Volume

254

Issue
Thesis Type
Degree Program
School
Publisher link
Patent number
Funder(s)
Grant identifier(s)
Rights Statement
Rights Statement
Item Access Status
Note
Access the data
Related item(s)
Subject

Biomedical and clinical sciences

Psychology

Cross-sample invariance

Delusion

Longitudinal invariance

Schizophrenia

The 21-item Peters et al. Delusions Inventory (PDI-21)

Persistent link to this record
Citation

Wang, YY; Shi, HS; Liu, WH; Yan, C; Wang, Y; Chiu, CD; So, SH; Lui, SSY; Cheung, EFC; Chan, RCK, Invariance of factor structure of the 21-item Peters et al. Delusions Inventory (PDI-21) over time and across samples, Psychiatry Research, 2017, 254, pp. 190-197

Collections