Tools for econometric analysis and economic modelling
with the traditional two-input Constant Elasticity of Substitution (CES) function
and with nested CES functions with three and four inputs.
The econometric estimation can be done by the Kmenta approximation,
or non-linear least-squares
using various gradient-based or global optimisation algorithms.
Some of these algorithms can constrain the parameters to certain ranges,
e.g. economically meaningful values.
Furthermore, the non-linear least-squares estimation
can be combined with a grid-search for the rho-parameter(s).
The estimation methods are described in Henningsen et al. (2021)