A nine-parameter version of the Heligman-Pollard formula.
"In this paper we outline and evaluate a nine-parameter version of the Heligman-Pollard formula.  In our applications, using mortality data for five European countries we found that this version provides closer fits to empirical mortality data than the classical eight-parameter formula, thus eliminating a source of systematic error in this latter formula."
D003710:Demography; D019049:Developed Countries; D005060:Europe; D005069:Evaluation Studies as Topic; D008962:Models, Theoretical; D009026:Mortality; D011153:Population; D011157:Population Dynamics; D012106:Research; D012107:Research Design
Demographic Factors; Developed Countries; Error Sources; Europe; Evaluation; Evaluation Methodology; Measurement; Models, Theoretical; Mortality; Population; Population Dynamics; Research Methodology