Validity and reliability of the General Alienation Scale in college students
10.3969/j.issn.1000-6729.2015.10.013
- VernacularTitle:一般疏离感量表测试大学生样本的效度和信度
- Author:
Wei CHEN
;
Shouying ZHAO
;
Jie LUO
;
Jinfu ZHANG
- Publication Type:Journal Article
- Keywords:
general alienation;
item response theory;
rating scale model;
psychometrics
- From:
Chinese Mental Health Journal
2015;(10):780-784
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To test the validity and reliability of the General Alienation Scale (GAS)in college students sample.Methods:Totally 1200 college students were surveyed,using classical test theory (CTT)and i-tem response theory (IRT)to test the psychometric properties of GAS.Under the framework of CTT,item selec-tion was performed with all data.Then,the sample was divided into two groups based on the input order to exam-ine the construct validity.Exploratory factor analysis (EFA)and parallel analysis (PA)were performed with odd group,while confirmatory factor analysis (CFA)was performed with even group.Criterion validity was examined with the short-form of the University of California Los Angeles Loneliness Scale (ULS-8),General Self-Efficacy Scale (GSES),Rosenberg Self-Esteem Scale (RSES).Under the framework of IRT,all data was fitted the rat-ing scale model (RSM),including the principal component analysis of residuals (PCAR),the item fit indexes (Infit and Outfit),measurement reliability (item separation index,item reliability,person separation index and person reliability)and the Wright map.Results:Under the framework of CTT,the GAS was retained 13 items except item 2 and 5.The results of both EFA and PA showed that 13 items of GAS was one-dimensional,and there was a good fit of CFA (χ2 /df=2.689,P <0.001,CFI =0.897,TLI =0.877,RMSEA =0.055,SRMR =0.046).The correlation coefficients were 0.57, -0.60 and -0.40 with the GAS,ULS-8,GSES,RSES
scores respectively (Ps <0.001 ).The Cronbach 's αcoefficient and confidence interval were 0.81 (0.80, 0.83).Under the framework of IRT,the ratio of first-paired eigenvalue was 1.6 in PCAR.The infit and outfit of retaining 13 items in CTT were from 0.6 to 1.4 excluding item 4.The item separation index,item reliability,per-son separation index and person reliability of the 12-item GAS were10.91,0.99,2.14 and 0.82 respectively.The item difficulty can matched with person ability,and they were closed to the normal distribution.Conclusion:It suggests that the General Alienation Scale (GAS)is of good validity and reliability,and it could be used as an ef-fective tool for measuring the alienation of college students.
