Dear R users 
 
The following question looks simple but I have spend alot of time to solve
it. I would highly appeciate your help.  
 
I have following dataset from family dataset : 
 
Here we have individuals and their two parents and their marker scores
(marker1, marker2,....and so on). 0 means that their parent information not
available. 
 
 
Individual 	Parent1	 Parent2	 mark1	 mark2 	
1	 0	 0	 12	 11	
2	 0	 0	 11	 22	
3	 0	 0	 13	 22	
4	 0	 0	 13	 11	
5	 1	 2	 11	 12	
6	 1	 2	 12	 12	
7	 3	 4	 11	 12	
8	 3	 4	 13	 12	
9	 1	 4	 11	 12	
10	 1	 4	 11	 12	
 
I want to recode mark1 and other mark2.....and so on column by looking
indvidual parent (Parent1 and Parent2). 
 
For example 
 
Take case of Individual 5, who's Parent 1 is 1 (has mark1 score 12) and
Parent 2 is 2 (has mark1 score 11). Individual 5 has mark1 score 11. Suppose
I have following condition to recode Individual 5's mark1 score:
 
For mark1 variable, If Parent1 score "11" and Parent2 score "22" and recode
indvidual 5's score, "12"=1, else 0
                                    If Parent1 score "12" and Parent2 score
"22" and recode individual 5's score, "22"=1, "12"= 0.5, else 0
                                    .........................more conditions
 
Similarly the pointer should move from individual 5 to n individuals at the
end of the file. 
 
 Thank you in advance
 
Umesh R 
 
 
 
 

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