[R] Conditional recoding for purpose of imputing

Bert Gunter gunter.berton at gene.com
Mon Feb 10 07:15:48 CET 2014

... Well, the syntax is corrected, but it doesn't solve her problem:
ifelse() leaves NA's as NA's.

"But:, you ask, "what should NA's become?"  As the OP does not tell
us,  we are left to read tea leaves: only the Shadow knows...*


* The Shadow also knows about ?is.na, which the OP should also
probably read about. In fact, she would do well to read the
"Introduction to R" tutorial -- or perhaps another of her choosing on
the web -- where she would probably learn enough so that she wouldn't
have to send posts like this in the first place!

Bert Gunter
Genentech Nonclinical Biostatistics
(650) 467-7374

"Data is not information. Information is not knowledge. And knowledge
is certainly not wisdom."
H. Gilbert Welch

On Sun, Feb 9, 2014 at 8:52 PM, David Winsemius <dwinsemius at comcast.net> wrote:
> On Feb 9, 2014, at 8:03 PM, Ana Genkova 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".
> The "==" has no place in the second and third arguments to ifelse . It should probably be:
> y <-  ifelse (x==1, "NO", "YES")
> (And do note that "==" is not an assignment operator in any context.)
> --
> David Winsemius
> Alameda, CA, USA
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