V. Estimates Derived by Extrapolation of Census Results A. Methods Requiring Two Censuses Only

Estimates based on the results of two or more censuses are more reliable, as a rule, than those based on one cepsus only. As already pointed out, the census data are likely to improve in quality as more experience in census taking is gained, and the availability of a series of census results makes possible a better appraisal of the accuracy of enumeration than is possible with a single census. A comparison of the results of two or more censuses provides, furthermore, a means of estimating the increase of population since the last census.