Demographer — a new version

Abstract

Demographer is a software package for population projections based on mathematical model which gives the dependence among number of births, population pyramid, fertility ratios and survival ratios. The model and the program structure are briefly described in Sec. 2. In the new version some transformations and new possibilities are added. In Sec. 3 transformations of death rates to survival ratios are described. When transforming five year survival ratios to one year survival ratios, the approximation error can be diminished by including the information of some demographically similar population. This new feature is described in Sec. 4. A simple algorithm for approximating changes of one year fertility ratios on the basis of changes of total number of births has been included. It is described in Sec. 5. Some interesting results related to decay time of decreasing population are given in Sec. 6.