Construction of Career Decision-Making Self-Efficacy Scale in the Digital Age of High School Students: Application of the Graded Response Model
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Abstract
The objectives of this research were to 1) construct a career decision-making self-efficacy scale for high school students in the digital age with two different test lengths: 25 items and 35 items, and 2) compare the psychometric properties of the scales using the graded response model. The sample consisted of 572 high school students from Princess Chulabhorn Science High School Buriram and Phetchaburi, selected through cluster random sampling. The research instruments were the 25-item and 35-item versions of the Career Decision-Making Self-Efficacy Scale in the digital age. Data were analyzed using frequency, percentage, mean, and the graded response model via the MULTILOG 7.03 program. The findings were as follows:
1. The Career Decision-Making Self-Efficacy Scale, based on the framework of Taylor & Betz, comprised five factors and ten indicators: (1) accurate self-appraisal, (2) gathering occupational information, (3) goal selection, (4) planning for the future, and (5) problem-solving. These factors were measured using both the 25-item and 35-item versions of the scale.
2. Regarding psychometric properties, the 25-item version yielded a higher mean slope parameter ( = 2.088) and average threshold parameters (
1= –2.944,
2 = –1.526,
3 = 0.171,
4= 1.787). The test information function (TIF) was 35.021 at
= 0.0, and the reliability was 0.9655. In contrast, the 35-item version had a lower mean slope parameter (
= 1.655) and threshold parameters (
1 = –2.921,
2 = –4.733,
3 = –0.020,
4= 1.526). The TIF was 32.492 at
= –1.4, and the reliability was 0.9650. In conclusion, the 25-item version demonstrated superior psychometric qualities—including higher slope parameters, threshold values, test information, and reliability—compared to the 35-item version.
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