The idea behind the treatment of NAs is that if you don't know what the
value is, how do you know if it's 1 or not (in your case)? Therefore, it's
normal that the result to your query is NA.
First, I guess your command was supposed to be:
y <- ifelse(x==1, 'NO', 'YES')
Secondly, if you want to ignore NAs in your condition, do:
y <- ifelse(x %in% 1, 'NO', 'YES')


On 10 February 2014 15:03, Ana Genkova <ani.genk...@gmail.com> wrote:

> Hello,
>
> I am trying the ifelse command for imputing a variable based on a
> conditional statement, but the NAs do not transform.  The code I am trying
> is:
>
> ifelse (x==1, y=="NO", y=="YES").  However, the number of NAs remains the
> same after the attempt.   I would like to turn all Y (NAs included) into a
> "YES" or a "NO".
>
> Thanks in advance,
>
> Ana
> --
> Ana Genkova
>
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>
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-- 
Yvan Richard

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