Dear Umesh, I could not figure out exactly what your recoding scheme was, so I do not have a specific solution for you. That said, the following functions may help you get started.
?ifelse # vectorized and different from using if () statements ?if # ?Logic ## logical operators for your tests ## if you install and load the "car" package by John Fox ?recode # a function for recoding in package "car" I am sure it is possible to string together some massive series of if statements and then use a for loop, but that is probably the messiest and slowest possible way. I suspect there will be faster, neater options, but I cannot say for certain without having a better feel for how all the conditions work. Best regards, Josh On Thu, Feb 17, 2011 at 6:21 PM, Umesh Rosyara <rosyar...@gmail.com> wrote: > 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 > > > > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles http://www.joshuawiley.com/ ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.