用dplyr彙整摘要資料

Printing data frame

• https://cran.r-project.org/web/packages/lemon/vignettes/lemon_print.html

# DT::datatable() %>%# DT::saveWidget("post2019_testing.html")

• by knitr::kable() https://cran.r-project.org/web/packages/lemon/vignettes/lemon_print.html

• kable_extra() Kable_extra to print table better

• theme_wp()