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This study aimed to validate an Indonesian version of the Mobile Phone Problem Use Scale (MPPUS) in a sample of high school students from South Tangerang City, Banten Province,, Indonesia. Throughout this process, we evaluated the scale's psychometric properties and examined the differential item functioning (DIF) across schools with and without a smartphone ban policy. The study used a cross-sectional survey design with a sample of 622 high school students (Mage = 16.10; SDage = 1.41). There were 312 respondents from schools with a smartphone ban and 310 from schools with no smartphone ban. We used confirmatory factor analysis (CFA), multiple indicators multiple causes (MIMIC) model, and Rasch Rating Scale Model (RSM) to analyze the data. The CFA and MIMIC model results indicated a good fit for the overall model using the pooled sample. Based on MIMIC model, one item was flagged as DIF. Furthermore, RSM analysis demonstrated that the Indonesian MPPUS has adequate psychometric properties. RSM-based DIF analysis identified four DIF items. Therefore, 23 of 27 items on the scale have the same meaning across schools with two different policies. Our findings provide empirical evidence that MPPUS performed well across students from schools with and without smartphone restrictions, despite the fact that the MPPUS was originally designed for the general population. The findings of this study can be used to develop an evidence-based policy for implementing smartphone policies in Indonesian schools. [ABSTRACT FROM AUTHOR]

This study aimed to validate the Indonesian version of the Life Orientation Test-Revised (LOT-R), a scale used to measure optimism. Despite being adapted in over 20 countries, its validation and adaptation reports are unavailable. This study used the rating scale model to evaluate its psychometric characteristics. The instrument was tested on 584 Indonesian high-school students aged 14 to 18 years (mean age: 16.02; SD: 1.39; 54.5% female and 45.5% male). The results indicated that the LOT-R's factor structure was unidimensional, based on the evidence from the Rasch analysis combined with a confirmatory factor analysis. Further, no local item dependence was identified. Based on the item fit statistics, all items fit the model. Nonetheless, their response categories functioned well, and the scale could reliably separate persons based on their optimism level; however, it had limitations regarding item reliability and separation because of the low number of items. Moreover, no differential item functioning was found based on gender and school type. Overall, the results indicated that this 6-item scale, including its psychometric properties, was satisfactorily reliable and valid to measure optimism in student samples, based on the Rasch analysis measurement standards. Implications and suggestions for future research have also been discussed. [ABSTRACT FROM AUTHOR]

This study aimed to validate the Indonesian version of the Muslim Daily Religiosity Assessment Scale (MUDRAS). This measure was tested on 766 Muslim college students aged 17–24 years (mean age = 20.01, SD = 1.4) who were students from six state Islamic universities and one private Islamic university in Indonesia. The data analysis technique used was the Partial Credit Model, which derived the polytomous Rasch model family. The results indicated that the MUDRAS has good psychometric characteristics for measuring religiosity in a sample of Indonesian Muslim students. All assumptions of the Rasch model were fulfilled. The person separation reliability was.92 and Cronbach's alpha was.93, indicating excellent internal consistency of the Indonesian MUDRAS. Confirmatory factor analysis revealed the higher order factor structure of the Indonesian MUDRAS. These findings provide the first Rasch model contribution to the MUDRAS and its first validation in a Muslim majority country. [ABSTRACT FROM AUTHOR]