Phenisiah - the way that I would see it is as multiple-case studies. While the 'region' is collective, individual countries posses many differing systems and, therefore, the outcomes are likely to vary quite widely. Using multiple case will 'compensate' for this fact should it occur.

Para cada pais,incluso por regiones previamente delimitadas por numero de poblacion, es importante utilizar caso por region, entendiendo que hay asuntos como la culturas, los contextos medioambientales, y caracteristicas interculturales que pueden hacer la diferencia, en homogenizar resultados. Se recomienda validacion previa de elementos muestrales, antes de recoger la informacion para llegar a conclusiones validas cientificamente hablando.

The type of case analysis you will have will really depend on your unit of analysis and research questions. This article might be helpful: https://nsuworks.nova.edu/tqr/vol13/iss4/2/

As mentioned before, it depends on your research question and subsequently on your research design. If you intend to compare different regions, Sub-Saharan Africa could be one case (but presumably aggregated from the data of countries belonging to that region). But if you intend to compare countries within that region, than the countries would be the cases.

I quite subscribe to the explanation of Steffen. Regarding the question as to whether your research is a case study analysis, I'd definently say yes, it is. However it relatively depends on your research objectives and your unit of analysis. If you do intend to compare different regions, you may use sub-saharan Africa as one case tò be compared with other region(s). Otherwise, you may compare countries within the region as individual cases.

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It can go either way. Look at the fundamentals of case study. These scribbles might help: https://www.researchgate.net/project/The-Physics-of-Case-Study

Thank you all for your answers. I will follow the multiple cases route as I will compare countries within SSA.

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It can be seen as multiple case studies or one depending what the context is. Remember you are generally talking about a continent made up of different countries

Es importante tener presente, que el estudio de casos multiples, exige revision de caso por caso de acuerdo a sus caracteristicas geograficas, culturales, modos de vida , idioma y contexto social.Los resultados deben establecerse en base a categorias, para un analisis e interpretacion de significados que expliquen sus diferencias y semejanzas, en funcion del objetivo general.