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Accordingly, aspects of the material presented in this section have been drawn from the United Nations.
Principles and Recommendations for Population and Housing Censuses, Revision 2 (UN Statistics Division 2008) and the.
However, since a crucial part of determining the overall reliability of a data set hinges on the internal coherence of the age-sex structure of the population, it is preferable to be able to determine which safe dates for unprotected sex data variables have been cleaned or edited as well.
However, only a fraction of the data and knowledge available in each country was used in working out these examples.To assist with the task, recommended standards and procedures have been drafted by the United Nations Statistics Division.If all the data were accurate, the two measures of increase (or decrease) should be balanced.When confronted with the need to apportion data on two dimensions (e.g.Dda obíhá kadého lékae, o kterém pedpokládá, e dokáe babiku vyléit.The age ratio for a given age group is the ratio of twice the population in that age group to the sum of the population in each of the adjacent age groups.For example, if the age statistics from the 2008 Census of Cambodia were at hand, the possibility of explaining certain irregularities in the 1998 data as the results of birth deficits or deaths in the period of the Khmer Rouges rule in the late 1970s.Furthermore, by rearranging and re-defining the components of this equation, separate appraisals can be made regarding the accuracy of birth, death and migration statistics.With the decennial programme of censuses recommended by the United Nations, a ten-year span of ages is typical.Similarly, even under conditions of very high mortality, it is unlikely that a cohort aged anywhere between 5 and 60 years at the beginning, will be reduced by one-half within a decade.Departures from unity would indicate either error in the data, or an inappropriate choice of life table.The comparison of the sex ratios by age calculated from the 2001 Census data, and those estimated for 2001 by the UN Population Division (Figure 5) also reveals notable differences.Cohort survival rates are not estimated for the very young, or for the open interval.Co kdybychom zkusili njaké nové pozice?The demographic changes observed in another country where conditions are presumed to be similar can sometimes be substituted for a theoretically expected configuration.The results from the PES, then, can be used to scale up (weight) the enumerated data to compensate for the undercount.With the onset of fertility decline in almost every country in the world, the assumptions necessary for comparisons of this type to produce meaningful results have become increasingly invalid.
"Sex ratios at birth in populations of Eastern and Southern Africa Southern African Journal of Demography 9 (1 91-96.