[R] Dataframes and text identifier columns

[Richard M. Heiberger]

Inp_dat<- read.csv("/File/Input data.csv")
out_put[i,]<-data.frame(Case, stdL, stdPP, stdSE, L, PP, PP_SE)

These two statements look like the source of the problem.
Add the optional argument
     stringsAsFactors=FALSE
to both.
Rich

On Sun, Jun 29, 2014 at 8:46 AM, Brian Willis <b.h.willis at bham.ac.uk> wrote:
> I am trying to incrementally add rows to an empty data frame. The data has 7
> columns, the last 6 are numeric.
>
> For the first columns I would like to include a text identifier, called
> ‘Case’ like Andrew, Burt, Charlie etc. that is also output to a data frame –
> this is where I am having the problem
>
> The identifiers are being input from file which automatically assigns them
> to a data frame
> Code:
>
> Inp_dat<- read.csv("/File/Input data.csv")
>
> out_put<-data.frame(Case=character(), StdL=numeric(), StdPP=numeric(),
> StdSE=numeric(), L=numeric(), MRPP=numeric(), MRSE=numeric(),
> stringsAsFactors=FALSE)
>
> for(i in 1:4)
> {
> if (i==1) b<-Andrew
> if (i==2) b<-Burt
> if (i==3) b<-Charlie
> if (i==4) b<-Dave
>
> pr <- Inp_dat$p[i]
> SE_pr <- Inp_dat$SE[i]
> r<- Inp_dat$r[i]
> n<- Inp_dat$n[i]
> Case<- levels(Inp_dat$Case)[i])
> …
>
> out_put[i,]<-data.frame(Case, stdL, stdPP, stdSE, L, PP, PP_SE)
>
> }
> out_put
>
>   Case     StdL          StdPP           StdSE           L
> MRPP            MRSE
> 1    1  19.466823   0.16432300   0.03137456   26.002294   0.2080145
> 0.03804692
> 2    1   2.334130    0.22566939   0.08962662    5.095703    0.3888451
> 0.08399101
> 3    1   2.588678    0.05502765   0.00454159   42.058326   0.4861511
> 0.02128030
> 4    1   7.857898    0.18457822   0.04372297    4.705487    0.1193687
> 0.01921609
>
>
> Unfortunately the Case column loses the labels Andrew, Burt …
>
> I’ve tried always to keep these, but are clearly doing something wrong. Can
> anyone help?
>
>
>
>
> --
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>
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