Iterative Proportional Fitting Algorithms for Nested Structures

The Iterative Proportional Fitting (IPF) algorithm operates on count data. This package offers implementations for several algorithms that extend this to nested structures: 'parent' and 'child' items for both of which constraints can be provided. The fitting algorithms include Iterative Proportional Updating < https://trid.trb.org/view/881554>, Hierarchical IPF , Entropy Optimization < https://trid.trb.org/view/881144>, and Generalized Raking . Additionally, a number of replication methods is also provided such as 'Truncate, replicate, sample' .