[R] 'ref' must be an existing level

[William Dunlap]

Adding the argument strip.white=TRUE to your call to read.csv() will remove
possible leading or trailing "white space" (spaces and tabs).

> str(read.csv( text = " honors,cum laude\nhonors, cum laude\n",
header=FALSE))
'data.frame':   2 obs. of  2 variables:
 $ V1: Factor w/ 2 levels " honors","honors": 1 2
 $ V2: Factor w/ 2 levels " cum laude","cum laude": 2 1
> str(read.csv( text = " honors,cum laude\nhonors, cum laude\n",
header=FALSE, strip.white=TRUE))
'data.frame':   2 obs. of  2 variables:
 $ V1: Factor w/ 1 level "honors": 1 1
 $ V2: Factor w/ 1 level "cum laude": 1 1



Bill Dunlap
TIBCO Software
wdunlap tibco.com

On Sat, Jul 9, 2016 at 10:08 AM, David Winsemius <dwinsemius at comcast.net>
wrote:

>
> > On Jul 9, 2016, at 4:32 AM, peter dalgaard <pdalgd at gmail.com> wrote:
> >
> > Hmm, and levels(m11$prog)?
>
> Shivi;
>
> See what this returns:
>
> "honors" %in% levels(m11$prog)
>
> The level is probably something like " honors"
>
> It's fairly easy to inadvertently create leading or trailing spaces when
> reading from comma-separated files.
>
> > test <- read.csv( text = " honors, others\n honors, others\n",
> header=FALSE)
> > test
>        V1      V2
> 1  honors  others
> 2  honors  others
> > nchar(test$V1)
> Error in nchar(test$V1) : 'nchar()' requires a character vector
> > nchar(as.character(test$V1))
> [1] 7 7
> > "honors" %in% levels(test$V1)
> [1] FALSE
>
> --
> David.
>
> >
> > (There's a chance that a space has sneaked in, but your HTML mail makes
> it hard to see column alignment)
> >
> > -pd
> >
> >> On 09 Jul 2016, at 12:50 , Shivi Bhatia <shivipmp82 at gmail.com> wrote:
> >>
> >> Hi Peter,
> >> It gives me breakdown of all categories with their respective freq.
> >> Diploma     general  honors
> >>         50          45         105
> >>
> >> On Sat, Jul 9, 2016 at 4:07 PM, peter dalgaard <pdalgd at gmail.com>
> wrote:
> >>
> >> What does table(m11$prog) tell you?
> >> -pd
> >>
> >>> On 09 Jul 2016, at 12:29 , Shivi Bhatia <shivipmp82 at gmail.com> wrote:
> >>>
> >>> Dear Team,
> >>>
> >>> I am running a multinomial logistic regression model for one of the
> >>> fictitious data before i implement the same on my real data.
> >>> Here i am trying to predict based some scores and economic group
> whether a
> >>> person will go for a diploma, general or honors.
> >>>
> >>> The code below:
> >>> m11$prog2<- relevel(m11$prog, ref = "honors"
> >>>
> >>> already loaded the nnet library. However i got the below error:
> >>> Error in relevel.factor(m11$prog, ref = "honors") :
> >>> 'ref' must be an existing level
> >>>
> >>> I have tried searching on SO and nabble but did not find an answer that
> >>> could help.
> >>>
> >>> Please suggest what is incorrect. Also checked the class of the var
> and is
> >>> a factor variable.
> >>>
> >>>      [[alternative HTML version deleted]]
> >>>
> >>> ______________________________________________
> >>> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> >>> 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.
> >>
> >> --
> >> Peter Dalgaard, Professor,
> >> Center for Statistics, Copenhagen Business School
> >> Solbjerg Plads 3, 2000 Frederiksberg, Denmark
> >> Phone: (+45)38153501
> >> Office: A 4.23
> >> Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> > --
> > Peter Dalgaard, Professor,
> > Center for Statistics, Copenhagen Business School
> > Solbjerg Plads 3, 2000 Frederiksberg, Denmark
> > Phone: (+45)38153501
> > Office: A 4.23
> > Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com
> >
> > ______________________________________________
> > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> > 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.
>
> David Winsemius
> Alameda, CA, USA
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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.
>

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