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Not applicables -> Not availables (#242) 

I think it's more accurate. ref.: (https://stat.ethz.ch/R-manual/R-devel/library/base/html/NA.html)
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Etienne B. Racine 2016-08-09 12:15:37 -04:00 committed by Hadley Wickham
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transform.Rmd
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@ -145,7 +145,7 @@ Whenever you start using complicated, multipart expressions in `filter()`, consi
### Missing values
One important feature of R that can make comparison tricky are missing values, or `NA`s ("not applicables"). `NA` represents an unknown value so missing values are "contagious": almost any operation involving an unknown value will also be unknown.
One important feature of R that can make comparison tricky are missing values, or `NA`s ("not availables"). `NA` represents an unknown value so missing values are "contagious": almost any operation involving an unknown value will also be unknown.
```{r}
NA > 5