Approximate the Variance of the Horvitz-Thompson Total Estimator
person("Roberto", "Sichera", email = "roberto.sichera@unipa.it", role = c("aut", "cre") )
Variance approximations for the
Horvitz-Thompson total estimator in Unequal Probability Sampling
using only first-order inclusion probabilities.
See Matei and Tillé (2005) and Haziza, Mecatti and Rao (2008) for details.

person("Roberto", "Sichera", email = "rob.sichera@gmail.com", role = c("aut", "cre") )

Replacement of the 'USGSstates2k' Package
USA.state.boundaries.data, install.load, drat, graphics,
rgdal, raster, ggspatial, ggplot2, knitr, rmarkdown, gotop
This is a replacement of the archived 'USGSstates2k' package.
It contains a map with the state boundaries of the USA obtained from the
USGS. Irucka worked with this data set while a Cherokee Nation Technology
Solutions (CNTS) USGS Contractor and/or USGS employee. This package
contains a subset of the data included in the 'USA.state.boundaries.data'
package, which is available in a 'drat' repository. To install that data
package, please follow the instructions at
<https://gitlab.com/iembry/usa.state.boundaries.data>.
This software is in the public domain because it contains
materials that originally came from the United States
Geological Survey (USGS), an agency of the United States
Department of Interior (DOI). For more information, see the
official USGS copyright policy at
https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits#copyright

Historical Boundaries of the United States of America, 1629-2000
c(person("Lincoln", "Mullen", email = "lincoln@lincolnmullen.com",
role = c("aut", "cre")), person("Dr. William M. Scholl Center for American
History and Culture, The Newberry Library", role = c("cph")))
This package provides spatial objects with the boundaries of
states or counties in the United States of America from 1629 to 2000.
It provides data from the Atlas of Historical County Boundaries.
Lincoln Mullen [aut, cre],
Dr. William M. Scholl Center for American History and Culture, The
Newberry Library [cph]