[R] transforming a dataset for association analysis

[Santosh Srinivas]

A more usable problem input would definitely help ... use dput to send a
reproducible sample to the group

Think the below should solve your problem

> read.csv("Book1.csv")
    Subject   Item Score
1 Subject 1 Item 1     1
2 Subject 1 Item 2     0
3 Subject 1 Item 3     1
4 Subject 2 Item 1     1
5 Subject 2 Item 2     1
6 Subject 2 Item 3     0

> library("reshape2")
> tDat.m <- melt(tDat)

> tDatCast <- acast(tDat.m,Subject~Item)
> tDatCast
          Item 1 Item 2 Item 3
Subject 1      1      0      1
Subject 2      1      1      0


-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of Ajay Ohri
Sent: 30 October 2010 16:27
To: Rhelp
Subject: [R] transforming a dataset for association analysis

Hi

I would like to transform  a data frame like

Subject    Item   Score
Subject 1 Item 1 1
Subject 1 Item 2 0
Subject 1 Item 3 1
Subject 2 Item 1 1
Subject 2 Item 2 1
Subject 2 Item 3 0
....
*to *

Subject      Item1   Item2   Item3 .....Item N
Subject1       1          0       1
Subject2       1          1        0
........
SubjectP..

Apologize for the simple nature of my query but I am stuck. How can I do
this transformation?

Regards

Ajay



Websites-
http://decisionstats.com
http://dudeofdata.com


Linkedin- www.linkedin.com/in/ajayohri




On Sat, Oct 30, 2010 at 2:39 PM, Alaios <alaios at yahoo.com> wrote:

> Hello everyone.
> I have written quite a big function that at the end correctly returns the
> values
> I want. I found a rare exception that I want to cover also. The easier for
> me
> would be to write something like that
>
>
> function(){
>
>  if (rare exception happened)
>      return that value
>
>  # The comes the code for normal execution
>  # ...
>  # ...
>  return value # Normal values to return
>
> }
>
>
>
> Would that be feasible with R or two returns statements are not accepted?
>
> Regards
> Alex
>
>
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
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> and provide commented, minimal, self-contained, reproducible code.
>

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and provide commented, minimal, self-contained, reproducible code.