Reproducible Multistage Mixed-Methods Sampling Methodology for Studying the Mental Health and Psychosocial Support (MHPSS) Workforce in Complex Humanitarian Settings: A Methodological Framework from Gambella, Ethiopia
Abstract:
Evidence on the Mental Health and Psychosocial Support (MHPSS) workforce in refugee settings remains limited due to workforce diversity, staff mobility, multiple organizations, geographically dispersed services, and incomplete personnel records. This study developed and implemented a rigorous mixed-methods sampling protocol to assess the MHPSS-related workforce in Ethiopia's Gambella Region. A convergent mixed-methods design combined multistage stratified probability sampling for the quantitative component with purposive sampling for the qualitative inquiry. The sampling frame was developed using the June 2026 5Ws matrix and organizational staffing records, then verified with focal persons. Sample size was calculated using Cochran's formula with finite population correction, plus 10% for non-response. Proportional allocation across organizations was used with intentional oversampling of smaller professional cadres. The verified sampling frame included 1,336 eligible personnel from 12 organizations. After finite population correction, the required sample was 299 participants, with a final target of 332 after accounting for non-response. Systematic random sampling was conducted within final strata, supported by reserve lists and replacement procedures. Sampling weights were specified to account for unequal selection probabilities. This protocol provides a transparent, reproducible, and practical approach for studying heterogeneous humanitarian MHPSS workforces, informing workforce planning, capacity development, and service improvement in refugee-hosting settings.References:
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