Simulation, estimation and inference for the geopolitical volatility (GEOVOL) model of Engle and Campos-Martins (2020) <doi:10.2139/ssrn.3685213>, where GEOVOL is modelled as a latent multiplicative volatility factor with heterogeneous factor loadings. Estimation is carried out as a maximization-maximization procedure, where GEOVOL and the GEOVOL loadings are estimated iteratively until convergence.

c(
person("Brigitte", "Charnomordic", email = "brigitte.charnomordic@inra.fr", role = c("aut")),
person("Hazaël", "Jones", email = "hazael.jones@supagro.fr", role = c("aut", "cre")),
person("Patrice", "Loisel", email = "patrice.loisel@inra.fr", role = c("aut")),
person("Isabelle", "Sanchez", email = "isabelle.sanchez@inra.fr", role = c("ctb")),
person("Ngoc-Phi", "Tran", email = "Ngoc-Phi.Tran@gmail.fr", role = c("ctr")))
Brigitte Charnomordic [aut],
Hazaël Jones [aut, cre],
Patrice Loisel [aut],
Isabelle Sanchez [ctb],
Ngoc-Phi Tran [ctr]
A zoning method and a numerical criterion for zoning quality are available in this package.
The zoning method is based on a numerical criterion that evaluates the zoning quality.
This criterion quantifies simultaneously how zones are heterogeneous on
the whole map and how neighbouring zones are similar. This approach allows comparison
between maps either with different zones or different labels, which is of importance
for zone delineation algorithms aiming at maximizing inter-zone variability. An optimisation
procedure provides the user with the best zonings thanks to contour delineation for a given map.
gstat, RandomFields, sp, maptools, deldir, fields, raster,
graphics, stats, utils,grDevices, rgeos, ggplot2

The package allows geometric objects defined in geozoo to be displayed in GGobi through the use of rggobi.
Barret Scloerke <bigbear1711@iastate.edu>, with
contributions from Dianne Cook <dicook@iastate.edu> and Hadley Wickham <h.wickham@gmail.com>.

Barret Scloerke <bigbear@iastate.edu>, with
contributions from Dianne Cook <dicook@iastate.edu> and Hadley Wickham <h.wickham@gmail.com>.