[R] Handling missing data

[Erik Iverson]

1) No need to post multiple times to the list
2) use the is.na function to test if a value is missing, not == or != 

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
> On Behalf Of premmad
> Sent: Friday, October 09, 2009 5:05 AM
> To: r-help at r-project.org
> Subject: Re: [R] Handling missing data
> 
> 
> I have one column
> x
> 97
> 94
> 91
> 90
> NA
> NA
> NA
> NA
> I tried
> i tried  this
> book$r<-ifelse(book$x!=NA,book$x+20,10)
> expected result
> 107
> 104
> 101
> 100
> 10
> 10
> 10
> 10
> 
> But got empty column of variable r.How to work with missing values of
> numeric variables.
> Why the numeric variable missing is assigned NA but not .,help in easy
> work
> for us.
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