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You are here because you are looking for the source code for IPSUR, but it isn't here. All of the source code for IPSUR.pdf can be found in the /inst/doc folder of the source package.
To build IPSUR yourself, or a modified copy, install the bookdown package and start a New Project... with RStudio in the existing directory of /inst/doc as the root folder. The source code for all chapters is located in the /inst/doc/Rmd directory.
We can run code like the following in an R Markdown file.
rnorm(10)
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