[R] Dataframes and text identifier columns

PIKAL Petr petr.pikal at precheza.cz
Thu Jul 3 09:48:43 CEST 2014 

Hi

What is the problem?

some comments in line

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Brian Willis
> Sent: Wednesday, July 02, 2014 1:33 PM
> To: r-help at r-project.org
> Subject: Re: [R] Dataframes and text identifier columns
>
> Apologies I was trying to simplify the programme and missed out four
> input files. The files on Andrew, Burt, Charlie  and Dave have the same
> format of one factor and 13 numeric variables with repeated
> measurements eg.
> Study v1      v2      v3      v4      v5      v6      v7      v8      v9      v10     v11
>       v12     v13
> A     153     4.0     2.00    2.00    145.00  0.67    0.01    49.00   0.34    0.04
>       0.96    -3.24   0.04
> B     96      33      3.0     13.0    47.0    0.9     0.2     4.2     0.1     0.5     0.5
>       -0.7    -0.7
>
> Inp_dat is
> Case  r       p       SE      n
> Andrew        0.03    0.01    0.0004  500
> Burt  0.08    0.111   0.04    50
> Charlie       0.04    0.022   0.0005  200
> Dave  0.2     0.028   0.006   85
>
> out_put starts as empty data frame and rows are added incrementally one
> for Andrew, one for Burt etc.
> If the code is
> Andrew<-read.csv("/File /Andrew.csv")
> Burt<-read.csv("/File /Burt.csv")
> Charlie<-read.csv("/File /Charlie.csv")
> Dave<-read.csv("/File /Dave.csv")
>
> 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
^^^^^^^^^^^^^^^^^
you do not use b in your further code so this is not necessary

>
> pr <- Inp_dat$p[i]
> SE_pr <- Inp_dat$SE[i]
> r<- Inp_dat$r[i]
> n<- Inp_dat$n[i]
> Case<- 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    2   2.334130    0.22566939   0.08962662    5.095703    0.3888451
> 0.08399101
> 3    3   2.588678    0.05502765   0.00454159   42.058326   0.4861511
> 0.02128030
> 4    4   7.857898    0.18457822   0.04372297    4.705487    0.1193687
> 0.01921609
>
>
>
> The Cases are labelled as integers 1 corresponding to Andrew, 2
> corresponding to Burt etc. instead of the intended text labels Andrew,
> Burt, Charlie and Dave.

If you want to change Case to labels just use

out_put$Case <- factor(out_put$Case), labels(Inp_dat$Case))

Regards
Petr

>
> Note all other columns are correct. Furthermore
>
> str(Case)
> Factor w/ 4 levels "Andrew","Burt",..: 4
>
> str(out_put)
>
> 'data.frame':   4 obs. of  7 variables:
>  $ Case  : chr  "1" "2" "3" "4"
>  $ StdL : num  19.47 2.33 2.59 7.86
> etc
>
>
> I have tried changing the line
>
> Case<- Inp_dat$Case[i]
>  to
>
> Case<- levels(Inp_dat$Case)[i]
>
> and this gives the following output
>
>   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
>
> str(Case)
>
> chr "Dave"
>
> and
>
> str(out_put)
>
> 'data.frame':   4 obs. of  7 variables:
>  $ Case  : chr  "1" "1" "1" "1"
>  $ StdL : num  19.47 2.33 2.59 7.86
> etc
>
>
> I’ve also tried adding, as suggested the stringsAsFactors=FALSE to the
> Inp_dat<- read.csv("/File/Input data.csv", stringsAsFactors=FALSE)
>
> This gives the same as the 2nd output above.
>
>
>
>
> --
> View this message in context: http://r.789695.n4.nabble.com/Dataframes-
> and-text-identifier-columns-tp4693184p4693389.html
> 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.

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