PCurve Build Methods

The property BuildMethod specifies the method that is used to build a complete population curve from a finite set of age-specific population numbers. The table below gives the BuildMethods currently supported

BuildMethod	Description
CONSTANT_DENSITY	Between age nodes the population density is constant
QUADRATIC_DENSITY	Between age nodes the population denstiy is a quadratic function of age with curvature continuous across age nodes.
HYBRID_DENSITY	Between age nodes the population density is a quadratic function of age. Density does not vary as much as for QUADRATIC_DENSITY but curvature is discontinuous across nodes.
HYBRID_EXPONENTIAL	Between age nodes the logarithm of the population denstiy is a quadratic function of age with discontinuous curvature.
FEENEY	Feeney's method for smoothing a population subject to age-heaping.
SPRAGUE	Smooth by aggregating the population into five-year groups then subdividing using Sprague.
WEIGHTED_AVERAGE	Smooth by a weighted moving average over age
CARRIER_FARRAG	Smooth by aggregating the population into five-year groups then adjusting using Carrier-Farrag then subdividing using Sprague.
KARUP_KING_NEWTON	Aggregate the population into five-year age groups, smooth using Karup-King-Newton then subdivide using Karup-King.
ARRIAGA	Aggregate the population into five-year age groups, smooth using Arriaga's light method, then subdivide using Sprague.
MOD_ARRIAGA	Same as Arriaga but smoothing starts at age five instead of age zero.
UNITED_NATIONS	Aggregate the population into five-year age groups, smooth using the United Nations method, then subdivide using Sprague.
STRONG	Aggregate the population into ten-year age groups, smooth using Arriaga's strong method, subdivide into five-year age groups using Arriaga's light method, then subdivide into single year age groups using Sprague.
PCLM	Expand an abridged population using the Penalised Composite Link Model
PTOPALS	Expand an abridged population using the PTOPALS (Dyrting, Flaxman, and Sharygin, 2022)