This report presents a comprehensive psychometric evaluation of the Vietnamese version of the 3-item Bedtime Procrastination Scale (VN-BPS-3). The analysis examines multiple aspects of measurement quality, including reliability, structural validity, and construct validity. Reliability is assessed through internal consistency metrics, specifically Cronbach’s alpha and McDonald’s omega, alongside detailed item-level diagnostics. Structural validity is evaluated using Confirmatory Factor Analysis (CFA) with the WLSMV estimator, appropriate for ordinal data. Construct validity is investigated through both convergent and known-groups approaches, including correlations with established measures such as the PHQ-9 (depressive symptoms), ISI (insomnia severity), and Social Jetlag indicators. This work was developed by Pham The Lam, Hanoi Medical University.

Teaching material for medical students. This document demonstrates the use of R Markdown for reproducible data analysis, data cleaning, and exploratory data analysis.

Reproducible R code and analysis for a meta-analysis of menstrual disorders in Southeast Asian medical students. Includes data cleaning, random-effects modeling (using the 'meta' package), subgroup analysis, heterogeneity assessment (I2, prediction intervals), and high-resolution visualization (Forest plots, Funnel plots).