[R] Problem with numeric variable

[Jean Eid]

can you give the line you are using to import the data.

On Sun, 14 Aug 2005 ftorrei2 at uiuc.edu wrote:

> Well, you were right. When I check with str() or summary(),
> the data frame appears as having a factor for that column.
> However, if I ask is.factor(C2), I get FALSE, and if I ask
> is.numeric(C2) I get TRUE. This seems strange.
> So I decided to reimport the dataframe, this time with NA as
> undefined values, and not ?. C2 was imported as a numeric
> variable, as checked with str() and is.numeric(). But I still
> get the indexes and not the values when I use C2 for any
> purpose, just as happened before. How can this be possible?
> All the other columns in the table behave properly.
> The only difference I see between this columns ans the others
> is that it contains NA values.
>
> Thanks again,
> Francisco Torreira
>
>
>
>
> ---- Original message ----
> >Date: Sun, 14 Aug 2005 10:11:15 +0100
> >From: Patrick Burns <pburns at pburns.seanet.com>
> >Subject: Re: [R] Problem with numeric variable
> >To: ftorrei2 at uiuc.edu
> >
> >I think your problem is that you have a factor rather
> >than a numeric vector (even though you say you checked
> >with 'is.numeric').  Missing values should be represented
> >by 'NA' and not by '?' which is what makes me think you
> >have a factor.
> >
> >Patrick Burns
> >patrick at burns-stat.com
> >+44 (0)20 8525 0696
> >http://www.burns-stat.com
> >(home of S Poetry and "A Guide for the Unwilling S User")
> >
> >ftorrei2 at uiuc.edu wrote:
> >
> >>Hello all,
> >>
> >>I posted a question some days ago without getting any answers,
> >>perhaps, as one of you kindly pointed out, because the
> >>question was not clearly stated. Let me reformulate it:
> >>In a frame, a column named C2 represents a numeric variable
> >>(checked with is.numeric(C2)). Some rows in the frame have an
> >>undefined value for C2, represented in the table by a ? sign.
> >>The remaining rows have numeric values with 2 decimals. For
> >>example, row 10 has 43.70 for C2, while row 1 has ?. The
> >>problem is that when I list C2 values (or when I try to plot
> >>them, etc), these values are not the ones that appeared in the
> >>table. Below are the first 3 lines of what I get when I list C2:
> >>
> >>
> >>>C2
> >>>
> >>>
> >>[1] 43 47 96 62 87 55 1 98 121 1 1 1 67 1 112 1 93 44
> >>[19] 85 569 52 110 126 95 92 60 36 383 373 298 274 406 208 175
> >>293 306
> >>[37] 305 172 134 115 94 84 104 99 64 271 269 310 268 359 443
> >>248 204 345
> >>
> >>These are not the correct values for C2, and I guess that they
> >>are just row numbers. How can I get the correct C2 values
> >>ready for analysis? Is this problem related to the fact that
> >>some rows have a ? value for C2?
> >>
> >>Thanks in advance,
> >>Francisco Torreira
> >>Francisco Torreira
> >>Spanish, Italian and Portuguese
> >>Univ. of Illinois at Urbana-Champaign
> >>707 South Mathews Aven.
> >>4031 FLB
> >>Urbana, IL, 61801
> >>
> >>______________________________________________
> >>R-help at stat.math.ethz.ch mailing list
> >>https://stat.ethz.ch/mailman/listinfo/r-help
> >>PLEASE do read the posting guide!
> http://www.R-project.org/posting-guide.html
> >>
> >>
> >>
> >>
> >>
> >
> Francisco Torreira
> Spanish, Italian and Portuguese
> Univ. of Illinois at Urbana-Champaign
> 707 South Mathews Aven.
> 4031 FLB
> Urbana, IL, 61801
>
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