[R] how to replace <NA> values

[arun]

I think this 

Elder1$age[Elder1$age==""]<-NA #is not needed

 Elder1$age<-as.numeric(as.character(Elder1$age)) #convert "" to NAs
A.K.


On Monday, January 20, 2014 9:53 AM, PIKAL Petr <petr.pikal at precheza.cz> wrote:
Hi

I believe that it is not what is wanted (if the OP knows exactly what he whants, which I doubt).

your result is

> Elder1
   ID age
1 ID1   3
2 ID2   2
3 ID3   1
4 ID6   0
5 ID8   0
>

however original output shall be

Elder1$age[Elder1$age==""]<-NA
Elder1$age<-as.numeric(as.character(Elder1$age))
Elder1$age[is.na(Elder1$age)]<-0
Elder1
   ID age
1 ID1  38
2 ID2  35
3 ID3   0
4 ID6   0
5 ID8   0
>

It is up to the OP to understand what age = 0 means.

Regards
Petr



> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of John Sorkin
> Sent: Monday, January 20, 2014 3:07 PM
> To: r-help at r-project.org; ecokingsly at yahoo.co.in
> Subject: Re: [R] how to replace <NA> values
>
> I hope the code below will show you how to co what you want to do.
> John
>
> Elder1 <- data.frame(
>   ID=c("ID1","ID2","ID3","ID6","ID8"),
>   age=c(38,35,"",NA,NA))
> Elder1
> # The age variable is a factor, we want it to be numeric
> class(Elder1[,'age'])
> # Convert factor to a numeric value.
> Elder1$age<-as.numeric(Elder1[,'age'])
> # Below you will see how you can test a value to see if it is NA.
> is.na(Elder1[,'age'])
> # Replace the NA values with a zero.
> Elder1[is.na(Elder1[,'age']),"age"]<-0
> # The final data frame with NAs replaced by zeros.
> Elder1
>
>
>
> John David Sorkin M.D., Ph.D.
> Professor of Medicine
> Chief, Biostatistics and Informatics
> University of Maryland School of Medicine Division of Gerontology and
> Geriatric Medicine Baltimore VA Medical Center 10 North Greene Street
> GRECC (BT/18/GR) Baltimore, MD 21201-1524
> (Phone) 410-605-7119
> (Fax) 410-605-7913 (Please call phone number above prior to faxing)
> >>> kingsly <ecokingsly at yahoo.co.in> 01/19/14 3:01 PM >>>
> Dear R community
>
> I have a large data set contain some empty cells. Because of that,  may
> be I am wrong, <NA> values are produced.
> Now I want replace both empty and <NA> values with zero.
>
> Elder1 <- data.frame(
>   ID=c("ID1","ID2","ID3","ID6","ID8"),
>   age=c(38,35,"",NA,NA))
> Output I am expecting
>
> ID   age
> ID1  38
> ID2  35
> ID3  0
> ID6  0
> ID8  0
>
> In advance I thank your help.
>
>
>
> --
> View this message in context: http://r.789695.n4.nabble.com/how-to-
> replace-NA-values-tp4683831.html
> Sent from the R help mailing list archive at Nabble.com.
>     [[alternative HTML version deleted]]
>
>
>
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