Psychometric evaluation of the self-undermining scale in South Africa using the Rasch model.

African Journal of Psychological Assessment Pub Date : 2025-05-20 eCollection Date: 2025-01-01 DOI:10.4102/ajopa.v7i0.163
Sergio L Peral
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Abstract

The self-undermining scale is used to assess employee behaviours that undermine job performance, including making mistakes, creating conflict, creating confusion and creating a backlog in work tasks. To date, its psychometric properties have not been thoroughly investigated using item-response theory applications, especially in South Africa. Applying the Rasch Rating Scale Model, this study aimed to investigate the reliability and internal validity of the self-undermining scale, including item fit and rating scale functionality. Data were collected from 318 South African employees using a non-experimental, cross-sectional survey design. The instrument demonstrated unidimensional scaling with Cronbach's alpha and person separation values of 0.77 and 1.57, respectively. Item and category fit statistics showed satisfactory fit to the Rasch model, with only one item warranting further attention. Some refinements regarding item wording and rating scale optimisation are provided.

Contribution: This study is the first to investigate the reliability and validity of the self-undermining scale through the Rasch Measurement Model. It also offers cautionary insights into the applicability of the scale to measure self-undermining among South African employees because of the lack of discriminatory power. Recommendations for further validation studies are provided.

使用Rasch模型对南非自我破坏量表进行心理测量评估。
自我破坏量表用于评估员工破坏工作绩效的行为,包括犯错、制造冲突、制造混乱和在工作任务中制造积压。迄今为止,特别是在南非,其心理测量特性尚未充分研究项目反应理论的应用。本研究运用Rasch评量表模型,探讨自毁量表的信度和内部效度,包括项目契合度和评量表功能。数据收集从318名南非员工使用非实验,横断面调查设计。该仪器具有一维标度,Cronbach's alpha和person separation值分别为0.77和1.57。项目和类别拟合统计显示满意的拟合Rasch模型,只有一个项目值得进一步注意。提供了一些关于项目措辞和评级尺度优化的改进。贡献:本研究首次采用Rasch测量模型对自毁量表的信度和效度进行了研究。它还提供了警示性的见解,说明该量表是否适用于衡量由于缺乏歧视性权力而导致的南非雇员的自我破坏。提出了进一步验证研究的建议。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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20 weeks
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