For method (1), stratification variable (a) yielded the most accurate re-estimate of the current total population.
Roger Hillson, Joel D. Alejandre, Kathryn H. Jacobsen, Rashid Ansumana, Alfred S.Bockarie, Umaru Bangura, Joseph M. Lamin, David A. Stenger 2015, 'Stratified Sampling of Neighborhood Sections for Population Estimation: A Case Studyof Bo City, Sierra Leone', PLOS ONE10.1371/journal.pone.0132850. Retrieved from PLOS CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)