Adjustment of Nigeria population censuses using mathematical methods

Abstract

This paper examines the adjustment of reported populations in Nigerian censuses. The ultimate objective is to provide reliable base populations which may be used to provide improved estimates of demographic parameters. Mathematical methods were applied to obtain adjusted data from the reported populations by sex and age in single years and five-year age groups in the 1963, 1991, and 2006 Nigerian censuses. Thereafter, the adjusted data were subjected to re-evaluation and used to obtain estimates of demographic parameters. Re-evaluation of the adjusted data shows improved quality of the adjusted data as well as of the estimates of some demographic parameters. It is therefore recommended that the adjusted data be used for estimating demographic parameters and population projection among others.Keywords: Adjustment of age and sex data, accuracy index, age misreporting, digit preference, age exaggeration, base population. RésuméCe document examine l'ajustement de la population rapportée dans des recensements nigérians. L'objectif final est de fournir les bases populations dignes de confiance qui peuvent être employées pour donner des évaluations améliorées des paramètres démographiques. Des méthodes mathématiques ont été appliquées pour obtenir les données ajusté des populations rapportées par sexe et par âge dans les seules anneés et de la tranche de cinq ans dans les recensements nigérians de 1963, 1991 et 2006. Ensuite, les données ajustées ont été soumises à la réévaluation et utilisées pour obtenir des évaluations des paramètres démographiques. Les résultats de la réévaluation des données ajustées prouvent que les qualités des données aussi bien que des évaluations ajustées de quelques paramètres démographiques se sont améliorées. Il est recommandé alors, que les données ajustées soient employées pour l'évaluation des paramètres et de la projection de population démographiques parmi d'autres.

Reported self-management of hypertension among adult hypertensive patients in a developing country: a cross-sectional study in a Nigerian tertiary hospital

“…This is one of few studies that assessed pattern of self-management of hypertension in Nigeria, which has one of the highest burden of the chronic disease globally. Unlike the few previous studies in Nigeria, this study assessed each component of self-management among wider age-range of hypertensive patients, including young people who now constitute more than two-thirds of the nation's population 17 . Hence, though most respondents were older adults, a significant proportion were 40 years old or younger, and therefore potentially bear much of the dsease burden in the region.…”

“…The South West region where the study was located, also has one of the highest prevalence rates and burden of disease due to hypertension in Nigeria18. This is key, considering that the study area and region is one of the most populated in Nigeria 20 , 21 , with high proportion of young people, who are potentially exposed to diverse psychosocial, occupational, environmental and other unknown risk factors of the chronic disease 22 . Therefore, local and regional health systems in developing countries need to anticipate high need for chronic disease care in the near future when these young adults may be developing complications 19 , 23 .…”

Estimation of Adult Mortality in Nigeria in the Era of Sustainable Development Goals: Insights from Census-Based Methods

“…It has been shown that the quality of reported age and sex data from the Nigerian population censuses are grossly defective; adjustment has been recommended for any meaningful usage of the reported census data, especially for the estimation of demographic parameters and developmental planning implementation in Nigeria (Ekanem, 1972;Nwogu, 2006;Ohaegbulem, 2015;Nwogu & Okoro, 2017). Nwogu & Okoro (2017) adjusted the reported populations in the Nigeria censuses using mathematical methods (such as the Carrier Farrag method, the Newton Halving method, and the United Nations Five-point method etc.). We observe that mathematical methods appear to have smoothed out genuine age patterns.…”

Assessment of the Validity of Assumption of Zero Net Migration in Estimation of Adult Mortality Using Preston Integrated Approach

“…As a result of poor vital registration records, data on adult mortality in most developing countries come from censuses and sample surveys [3,2]. Data from these two sources have been shown to be defective [4,2] [ [5][6][7][8][9][10].…”