c(
person("In Song", "Kim", email = "insong@mit.edu", role = c("aut", "cre")),
person("Adam", "Rauh", email = "amrauh@umich.edu", role = c("aut")),
person("Erik", "Wang", email = "haixiaow@Princeton.edu", role = c("aut")),
person("Kosuke", "Imai", email = "imai@harvard.edu", role = c("aut"))
)
Implements a set of methodological tools
that enable researchers to apply matching methods to
time-series cross-sectional data. Imai, Kim, and Wang
(2021) <http://web.mit.edu/insong/www/pdf/tscs.pdf>
proposes a nonparametric generalization of the
difference-in-differences estimator, which does not rely
on the linearity assumption as often done in
practice. Researchers first select a method of matching
each treated observation for a given unit in a
particular time period with control observations from
other units in the same time period that have a similar
treatment and covariate history. These methods include
standard matching methods based on propensity score and
Mahalanobis distance, as well as weighting methods. Once
matching is done, both short-term and long-term average
treatment effects for the treated can be estimated with
standard errors. The package also offers a visualization
technique that allows researchers to assess the quality
of matches by examining the resulting covariate balance.
Rcpp (>= 0.12.5), data.table, ggplot2, CBPS, stats, graphics,
grDevices, MASS, Matrix, igraph, methods

Linear models for panel data: the fixed effect model and the
random effect model

person(given = "Patrick",
family = "Bogaart",
role = c("aut", "cre"),
email = "pwbogaart@gmail.com",
comment = c(ORCID = "https://orcid.org/0000-0002-8612-1289"))
Sankey diagrams are a powerfull and visually attractive way
to visualize the flow of conservative substances through a system.
They typically consists of a network of nodes, and fluxes between them,
where the total balance in each internal node is 0, i.e. input equals output.
Sankey diagrams are typically used to display energy systems, material flow accounts etc.
Unlike so-called alluvial plots, Sankey diagrams also allow for cyclic flows:
flows originating from a single node can, either direct or indirect, contribute to the input of that same node.
This package, named after the Greek aphorism Panta Rhei (everything flows),
provides functions to create publication-quality diagrams, using data in tables (or spread sheets)
and a simple syntax.
Patrick Bogaart [aut, cre] (<https://orcid.org/0000-0002-8612-1289>)