* gnu/packages/statistics.scm (r-roxygen2): Update to 6.1.0. [propagated-inputs]: Add r-pkgload and r-purrr. [native-inputs]: Add r-knitr.
* gnu/packages/statistics.scm (r-roxygen2): Update to 6.1.0. [propagated-inputs]: Add r-pkgload and r-purrr. [native-inputs]: Add r-knitr.