import knitr; added some resources

main.Rmd

@@ -1,8 +1,12 @@
-# h1
-
 ```{r knitr_options, include=FALSE}
+# knitr::knit imports knitr automatically
+# rmarkdown::render does not import knitr automatically
+library(knitr)
 opts_chunk$set(fig.path='figures/')
 ```
+<!-- https://yihui.name/knitr/options/ -->
+
+# h1
 
 ```{sh}
 date
@@ -64,11 +68,24 @@ Pi is `r pi`.
 plot(1:10)
 ```
 
-## R session info
+\pagebreak
+
+# Resources
+
+[knitr in a knutshell](http://kbroman.org/knitr_knutshell/)
+
+[using pander with knitr](http://rapporter.github.io/pander/knitr.html)
+
+[pander options](http://rapporter.github.io/pander/#pander-options)
+
+[CrossTable documentation](https://www.rdocumentation.org/packages/descr/versions/1.1.3/topics/CrossTable)
+
+[R in clinical research](http://www.r-clinical-research.com/)
+
+\pagebreak
+
+# R session info
+
 ```{r session_info}
 sessionInfo()
 ```
-
-<!--
-https://yihui.name/knitr/options/
--->