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.

Answer 2

I'd use qplot instead of ggplot in this way:

qplot(x=column, data=subset(dataframe,!is.na(column)))

I hope this helps.

Answer 3

assuming your data is in a data frame called dat

newdat <- dat[!is.na(dat$Factor), ]

not sure how to solve the problem inside of ggplot code