Hi > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > project.org] On Behalf Of kingsly > Sent: Tuesday, January 21, 2014 7:22 AM > To: r-help@r-project.org > Subject: Re: [R] how to replace <NA> values > > First of all I thank all the friends. > > Though I have written zero to replace NA in previous email, I will > replace with extreme value (99999).
Why? Many R functions has ability to work smoothly with NA values but AFAIK none is able to work with 99999 values. It is the same as if you wanted to change bicycle tyres to wooden rim. You could ride but not with the same comfort. Regards Petr > > > > On Tuesday, 21 January 2014 7:05 AM, jwd [via R] <ml- > node+s789695n4683894...@n4.nabble.com> wrote: > > On Sun, 19 Jan 2014 11:39:43 -0800 (PST) > > kingsly <[hidden email]> wrote: > > > ________________________________ > The age variable is being read in as a factor because of the "". If > you were to replace it with NA, the type becomes numerical: > > Before replacement: > > str(Elder1) > 'data.frame': 5 obs. of 2 variables: > $ ID : Factor w/ 5 levels "ID1","ID2","ID3",..: 1 2 3 4 5 > $ age: Factor w/ 3 levels "","35","38": 3 2 1 NA NA > > Notice that the "" is treated as a factor level. > > After: > > str(Elder1) > 'data.frame': 5 obs. of 2 variables: > $ ID : Factor w/ 5 levels "ID1","ID2","ID3",..: 1 2 3 4 5 > $ age: num 38 35 NA NA NA > > SO, the question, is what do you want to do with that column? An "NA" > value tells you honestly that the information is missing. Replacing it > with a zero can be misleading and can bias some basic parameter > estimates. > > After you know how you want to treat the data in that field, you may > have a better idea of how to handle the missing data. > > JWD > > ______________________________________________ > [hidden email] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting- > guide.html > and provide commented, minimal, self-contained, reproducible code. > > > > > ________________________________ > > If you reply to this email, your message will be added to the > discussion below: http://r.789695.n4.nabble.com/how-to-replace-NA- > values-tp4683831p4683894.html > To start a new topic under R help, email ml- > node+s789695n78969...@n4.nabble.com > To unsubscribe from R help, click here. > NAML > > > > -- > View this message in context: http://r.789695.n4.nabble.com/how-to- > replace-NA-values-tp4683831p4683896.html > Sent from the R help mailing list archive at Nabble.com. > [[alternative HTML version deleted]] ________________________________ Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a jsou určeny pouze jeho adresátům. 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