Tools for optimal subset matching of treated units
and control units in observational studies, with support
for refined covariate balance constraints, (including
fine and near-fine balance as special cases). A close
relative is the 'rcbalance' package.  See Pimentel,
et al.(2015) <doi:10.1080/01621459.2014.997879>
and Pimentel and Kelz (2020)
<doi:10.1080/01621459.2020.1720693>. The rrelaxiv
package, which provides an alternative solver for
the underlying network flow problems, carries an
academic license and is not available on CRAN, but
may be downloaded from Github at
<https://github.com/josherrickson/rrelaxiv/>.

Parametric Bootstrapping to Control Rank Conditional Coverage
Functions to implement the parametric and non-parametric bootstrap
confidence interval methods described in Morrison and Simon (2017) <arXiv:1702.06986>.

Identify, convert and handle dates as used within the Swedish cancer register and associated cancer quality registers in Sweden. Especially the cancer register sometimes use nonstandard date variables where day and/or month can be "00" or were the date format is a mixture of"%Y-%m-%d", "%Y%m%d" and "%y%V" (two digit year and week number according to ISO 8601,which is not completely supported by R).These dates must be approximated to valid dates before being used in for example survival analysis. The package also includes some convenient functions for calculating "lead times" (relying on 'difftime') and introduce a "year" class with relevant S3-methods to handle yearly cohort.

Miscellaneous R Functions for Swedish Regional Cancer Centers
Functions either required by other Swedish Regional Cancer Center packages or standalone functions outside the scope of other packages.
checkpoint, testthat, R.rsp, rvest, xml2

Safely Manage API Keys and Load Data from a REDCap or Other
Source
c(person("Shawn",    "Garbett",  email = "Shawn.Garbett@vumc.org",        role = c("aut", "cre")),
person("Hui",      "Wu",       email = "Hui.Wu@vumc.org",               role = c("aut")),
person("Cole",     "Beck",     email = "Cole.Beck@vumc.org",            role = c("aut"))
)
Shawn Garbett [aut, cre],
Hui Wu [aut],
Cole Beck [aut]
The handling of an API key (misnomer for password) for protected
data can be difficult. This package provides secure convenience functions for
entering / handling API keys and pulling data directly into memory. By default
it will load from REDCap instances, but other sources are injectable via
inversion of control.
redcapAPI, getPass, yaml, keyring (>= 1.3.0)