Subset function not removing NAs

Question

I have a data frame like this:

df

Date     Player Injured
1/2/2012      A      No
1/3/2012      B     Yes
1/4/2012      C      No
1/5/2012      B      NA
1/5/2012      A      No
1/7/2012      B     Yes
1/8/2012      A      No
1/3/2012      B     Yes
1/2/2012      D      No
1/3/2012      F      NA

I am trying to use subset function to select players that injury info is NA:

x <- subset(df, injured!="NA")

x data frame is not populating. It seems very straightforward. Any ideas what I am doing wrong here?

Solution

Try x<-subset(df, is.na(Injured)) .