[R] Error Help: duplicate?

[Jeff Newmiller]

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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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>
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