naniar
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Look at how other stats/programming languages handle missing values
Following on from discussion with @MilesMcBain in #31, it would be worthwhile to see how other languages and stats languages handle missing values and critique/borrow from these.
Here's a start on STATA: http://www.ats.ucla.edu/stat/stata/modules/missing.html
https://cran.rstudio.com/web/packages/WVPlots/
STATA: http://www.stata.com/manuals13/rmisstable.pdf