[R] Error Help: duplicate?

[peter dalgaard]

On Aug 1, 2013, at 18:09 , Jeff Newmiller wrote:

> Your example is not reproducible, so we can only guess what is happening. Please read the footer of this (or any other R-help) email and follow those instructions. You may also find the discussion at http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example helpful.

However, eliminating the reuse of newdata2 might help. In particular, if you accidentally repeat the cbind() step, you _will_ end up with a data frame with duplicate column names.

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> Docbanks84 <mbanks3 at partners.org> wrote:
>> Hi,
>> 
>> I'm working through practice data in R and I am held up on this step. I
>> am
>> not sure why there is an error that claims there is a duplicate
>> subscript
>> for columns?
>> 
>> Does anyone know what this means and how I can fix it?
>> 
>>> 
>> newdata2<-cbind(newdata2,predict(mylogit,newdata=newdata2,type="link",se=TRUE))
>>> newdata2<-within(newdata2,{PredictedProb<-plogis(fit)
>> + LL<-plogis(fit- (1.96 * se.fit))
>> + UL<-plogis(fit + (1.96 *se.fit))
>> + })
>> Error in `[<-.data.frame`(`*tmp*`, nl, value = list(UL =
>> c(0.549206434665668,  : 
>> duplicate subscripts for columns
>> 
>> 
>> 
>> --
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>> Sent from the R help mailing list archive at Nabble.com.
>> 
>> ______________________________________________
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>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
> 
> ______________________________________________
> R-help at r-project.org mailing list
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-- 
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com