Both instruments examined nonmeasurable factors that are subject to the evaluator's judgment, without using operational definitions of the relevant variables.
Lucía Alonso, Mónica Pujadas, Raquel Rosa 2011, 'Evaluación de capacidades básicas para cumplir el Reglamento Sanitario Internacionalen puntos de entrada de Uruguay Assessment of core capacities for enforcement of theInternational Health Regulations at points of entry in Uruguay', Revista Panamericana de Salud Públicahttp://www.scielosp.org/scielo.php?script=sci_arttext&pid=S1020-49892011000700009. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
This information supplied to the observer served to validate its ability to recover the time evolution of nonmeasurable metabolites.
Alfonso Sepulveda-Galvez, Jesus A. Badillo-Corona, Isaac Chairez 2018, 'Distributed Finite-Time State Estimation of Interconnected Complex Metabolic Networks',Complexityhttp://dx.doi.org/10.1155/2018/6879013. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)