[R] na.rm = T treatment by ggplot2's geom_bar

[Dimitri Liakhovitski]

To clarify: my question is not about "who could I exclude NAs from being
counted" - I know how to do that.
My question is: Why na.rm = T is not working for geom_bar in this case?

On Thu, Jul 27, 2017 at 8:24 AM, Dimitri Liakhovitski <
dimitri.liakhovitski at gmail.com> wrote:

> Hello!
>
> I am trying to understand how ggplot2's geom_bar treats NAs.
> The help file says:
>
> library(ggplot2)
> ?geom_bar
> na.rm: If FALSE, the default, missing values are removed with a warning.
> If TRUE, missing values are silently removed.
>
> I am trying it out:
> md <- data.frame(a = c(letters[1:5], letters[1:4], letters[1:3], rep(NA,
> 3)))
> str(md); levels(md$a)
>
> ggplot(data = md, mapping = aes(x = a)) +
>   geom_bar(na.rm = F)
> It runs without warnings and generates counts for each factor level AS
> WELL AS the NAs. Makes sense.
>
> Now, I don't want the NAs to be counted. So, I run:
> ggplot(data = md, mapping = aes(x = a)) +
>   geom_bar(na.rm = T)
>
> But I still have NAs in the picture. Why?
> What am I missing?
>
> Thank you!
> --
> Dimitri Liakhovitski
>



-- 
Dimitri Liakhovitski

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