Dear AJSS,
Perhaps:
# -------------------
# Data set
# -------------------
mydata=read.table(textConnection("
V1 V2 V3
1 15 10 4
2 6 4 7
3 10 5 2
4 8 6 6"),header=TRUE)
closeAllConnections()
# -------------------
# Regression models
# -------------------
# Combinations
library(forward)
comb=t(fwd.combn(colnames(mydata),2))
# Summaries
res=apply(comb,1,function(x){
y1=mydata[,x[1]]
x1=mydata[,x[2]]
m=lm(y1~x1)
summary(m)
}
)
names(res)= apply(comb,1,paste,collapse="/",sep="")
# Output in an external file
sink("C:/out.txt")
res
sink()
HTH,
Jorge
On Sun, Oct 19, 2008 at 11:38 AM, Amarjit Singh Sethi
<[EMAIL PROTECTED]>wrote:
> Dear Jorge/Dieter
> Thank you very much for your help. I indeed have been able to get names of
> the variables through 'noquote( )'statement. Yet my problem (regarding
> running regression analysis iteratively: of V1 upon V2; of V1 upon V3; and
> of V2 upon V3) could not be solved. My input data:
>
> V1 V2 V3
> 1 15 10 4
> 2 6 4 7
> 3 10 5 2
> 4 8 6 6
> I tried the following code:
> x=read.table("sample.txt",header=T,sep="\t")
> sink("out.txt")
> for (i in 1:2){
> dep=noquote(nm[i])
> for(j in i+1:3){
> ind=noquote(nm[j])
> slr=lm(dep ~ ind, data=x)
> smr=summary(slr)
> smr
> }
> }
> sink()
> But I could not get any results. Kindly help or suggest suitable
> alternative.
> The data and the code are given as attachments also.
> Regards
> ajss
>
>
> --- On *Sun, 19/10/08, Jorge Ivan Velez <[EMAIL PROTECTED]>* wrote:
>
> From: Jorge Ivan Velez <[EMAIL PROTECTED]>
> Subject: Re: [R] Getting names of variables without quotes
> To: [EMAIL PROTECTED]
> Cc: r-help@r-project.org
> Date: Sunday, 19 October, 2008, 1:04 AM
>
>
>
> Dear AJSS,
> Perhaps ?noquote might be useful for you. Here is an example:
>
> > x=c('V1','V2','V3','V4')
> > x
> [1] "V1" "V2" "V3" "V4"
> > noquote(x)
> [1] V1 V2 V3 V4
>
> HTH,
>
> Jorge
>
>
> On Sat, Oct 18, 2008 at 3:04 PM, Amarjit Singh Sethi <[EMAIL PROTECTED]>wrote:
>
>> Â
>> Dear R-helpers,
>> hello
>> I am seeking your help in somehow getting names of variables without
>> quotes (" ").
>> Let us say, we have a table with 3 variables V1, V2 and V3. After the
>> table is read, I get names of the variables (thro' the following code) as
>> under quotes (like "V1"Â rather than the original representation V1)
>> Â
>> Â x=read.table("sample.txt",header=T,sep="\t")
>> > x
>> Â Â Â V1Â Â Â V2Â Â Â V3
>> 1Â 15Â Â Â Â 10Â Â Â Â Â 4
>> 2Â Â Â 6Â Â Â Â Â Â 4Â Â Â Â Â Â 7
>> 3Â 10Â Â Â Â Â 5Â Â Â Â Â Â 2
>> 4Â Â Â 8Â Â Â Â Â 6Â Â Â Â Â Â 6
>> > nm=names(x)
>> > nm
>> [1] "V1" "V2" "V3"
>> Â
>> In fact I need the variables in the original representation (i.e., as
>> they appear in the input data file) so as to use them repeatedly (through
>> loop statement) in regression analysis. Kindly help.
>> Regards
>> ajss
>>
>>
>>
>>
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>>
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