تدريج مفردات مقياس التسويف الأكاديمي في ضوء نموذج سلم التقدير لأندريش والدالة التمييزية باستخدام تحليل الملفات الكامنة للسمة لدى طلاب الجامعة
The aim of this study was to calibrate items of the academic procrastination scale among first-year students at the Ismailia faculty of education and estimate the validity of items and individuals’ separation. The study aimed to classify students into two homogeneous groups based on the total score on the scale by latent profile analysis (high and low procrastinators). The initial sample size was 320 male and female students, and after items and participants omitted, the final sample size was 131 students. The scale consisted of 25 items before calibration, and after equaled 18 items. Andrich's model has item’s difficulty values ranged from -2.46 to -1.59, with an average of -2.08. The individual abilities ranged from -6.08 to 6.75, indicating a wide range of data and substantial individual differences in academic procrastination among students. Using confirmatory factor analysis, the model's validity was verified based on goodness-of fit indices for the general factor model of the first order. The differential item functioning (DIF) between high and low academic procrastination latent profile analysis clusters was calculated, and the item showed 11 discriminative performances which indicates a bias in interpreting academic procrastination for one group over the other. (Published abstract)