How to remove NA from a factor variable (and from a ggplot chart)?

Question

I have a problem with NA in a factor variable since ggplot includes them in the plot as if they are another category/level. I would like to drop the missing data. I am sorry

Answer 1

Answers on this related thread: NA's are being plotted in boxplot ggplot2

In brief, instead of the usual:

ggplot(data=data)

use

ggplot(data=na.omit(data[,c("var1","var2",...)])) 

where var1, var2 etc are the variables you are plotting.