[R] multiple column comparison

[ryanfuller]

Hello, 
I have a very large content analysis project, which I've just begun to
collect training data on. I have three coders, who are entering data on up
to 95 measurements. Traditionally, I've used Excel to check coder agreement
(e.g., percentage agreement), by lining up each coder's measurements
side-by-side, creating a new column with the results using if statements.
That is, if (a=b, 1, 0). With this many variables, I am clearly interested
in something that I don't have to create manually every time I check
percentage agreement for coders. 

The data are set up like this: 

ID        CODER V1  V2   V3   V4 ... V95
ID1      C1         y      int   doc  y
ID2      C1         y      ext   doc  y
ID1      C2        n        int  doc  y
ID2      C2        n        int  doc  y
ID1     C3         n         int  doc  y
ID2     C3         n         int  doc  y

I would like to write a script to do the following:
For each variable compare each pair of coders using if statements (e.g., if
C1.V1.==C1.V2, 1, 0)

ID        C1.V1  C2.V1 C3.V1
ID1       y           y           y 
ID2      y            y           y      

For each coding pair, enter the resulting 1s and 0s into a new column. 

The new column name would reflect the results of the comparison, such as
C1.C2.V1

I'd ideally like to create this so that it can handle any number of
variables and any number of coders. 

I appreciate any thoughts, help, and pointers on this. 

Thanks in advance. 

Best,
Ryan Fuller
Doctoral Candidate, Communication
Graduate Student Researcher, Carsey-Wolf Center
http://carseywolf.ucsb.edu
University of California, Santa Barbara



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