In material wear experiments, such as the Ball Mill Abrasion Test (BMAT), it is crucial to know the number of specimens to be used in each experiment to produce accurate and reliable results. In BMAT, however, a structured way of determining the necessary number of balls per type of material to be included in the experiments has not been considered to date. This article shows, using statistical tools and adhering to the standards that govern these experiments, that the optimal number of balls per type of material to be included in each experiment is 6. In addition, it is shown that if the initial differences between the balls are reduced, it is possible to obtain more accurate and reliable results.

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Se determinó un perfil de la infraestructura de una población rural en Venezuela con respecto a la vivienda según el sector, realizando un análisis de correspondencias simple en donde se compararon las variables de infraestructura con respecto a la variable “sector”.  La base de datos se obtuvo de una investigación previa basada en un cuestionario del censo de población y vivienda del Instituto Nacional de Estadística (INE) de una muestra de 226 hogares. Los resultados obtenidos variaron según el tipo de infraestructura y servicios básicos del sector. La técnica de análisis de correspondencias simple mostró ventajas y desventajas como método para caracterizar poblaciones.   Palabras clave: Análisis de correspondencias simple, análisis multivariante, caracterización, infraestructura.   Abstract A profile of the infrastructure of a rural population in Venezuela was determined with respect to housing according to the sector, performing a simple correspondence analysis in which the infrastructure variables were compared with respect to the variable "sector". The database was obtained from a previous investigation based on a questionnaire of the population and housing census of the National Institute of Statistics (INE) of a sample of 226 households. The results obtained varied according to the type of infrastructure and basic services in the sector. The simple correspondence analysis technique showed advantages and disadvantages as a method to characterize populations.   Keywords: Simple Correspondence Analysis, Multivariate Analysis, Characterization, Infrastructure.