[R] factor levels > numeric values

[David L Carlson]

Also look at the Frequently Asked Questions document that comes with your R installation:

7.10 How do I convert factors to numeric?

It may happen that when reading numeric data into R (usually, when reading in a file), they come in as factors. If f is such a factor object, you can use

as.numeric(as.character(f))

to get the numbers back. More efficient, but harder to remember, is

as.numeric(levels(f))[as.integer(f)]

In any case, do not call as.numeric() or their likes directly for the task at hand (as as.numeric() or unclass() give the internal codes).

-------------------------------------
David L Carlson
Department of Anthropology
Texas A&M University
College Station, TX 77840-4352

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Gerrit Eichner
Sent: Wednesday, November 12, 2014 8:06 AM
To: David Studer
Cc: r-help at r-project.org
Subject: Re: [R] factor levels > numeric values

Hello, David,

take a look at the beginning of the "Warning" section of ?factor.

  Hth  --  Gerrit

> Hi everybody,
>
> I have another question (to which I could not find an answer in my r-books.
> I am sure, it's not a great issue, but I simply lack of a good idea how to
> solve this:
>
> One of my variables gets imported as a factor instead of a numeric variable.
> Now I have a...
> Factor w/ 63 levels "0","0.02","0.03",..: 1 NA NA 1 NA NA 1 1 53 10 ...
>
> How can I transform these factor levels into actual values?
>
> Thank you very much for any help!
> David
>
> 	[[alternative HTML version deleted]]
>
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