Another possibility could have been that the variations found occurred because of methodological differences in relevant technical aspects such as determining sample selection procedure and sample size. Implementing the pilot sampling, besides facilitating fieldwork methodology refinement, contributed towards quantifying the absolute error assumed for overall PCP estimation, as well as in-stratum approximated variability. This data was used for computing final sample size.
La labor del muestreo piloto, además de facilitar el afinamiento de la metodología del trabajo de campo, permitió la cuantificación del error absoluto que se asumió para la estimación de la PPC global y la variabilidad aproximada de la PPC en cada estrato, elementos que determinaron el tamaño de muestra final.