multgee(>= 1.2), gee, knitr, rmarkdown, bookdown
bookdown, gee, knitr, markdown, multgee(>= 1.2)
bookdown, gee, knitr, markdown, multgee (>= 1.2), testthat,
covr
bookdown, covr, gee, knitr, multgee (>= 1.2), rmarkdown,
testthat