Hi All, Just hoping some one can give me a hand with a problem...
I have a dataframe (DF) with about 5 million entries that looks something like the following: >DF ID Cl Co Brd Ind A AB AB 1 S-3 IND A BR_F BR_F01 1 0 0 2 S-3 IND A BR_F BR_F01 1 0 0 3 S-3 IND A BR_F BR_F01 1 0 0 4 S-3 IND A BR_F BR_F01 1 0 0 5 S-3 IND A BR_F BR_F01 1 0 0 6 S-3 IND A BR_F BR_F01 0 1 0 7 S-3 IND A BR_F BR_F02 0 0 1 8 S-3 IND A BR_F BR_F02 0 1 0 9 S-3 IND A BR_F BR_F02 1 0 0 10 S-3 IND A BR_F BR_F02 1 0 0 11 S-3 IND A BR_F BR_F02 1 0 0 12 S-3 IND A BR_F BR_F02 1 0 0 I am interested in retrieving the frequency of A for everything with the same Ind code. I have initially created a column called 'frq' that calculates the individual A frequency >DF$frq=apply(DF,1,function(x) if(x[6]==1)1 else if (x[7]==1)0.5 else 0) >DF ID Cl Co Brd Ind A AB AB frq 1 S-3 IND A BR_F BR_F01 1 0 0 1 2 S-3 IND A BR_F BR_F01 1 0 0 1 3 S-3 IND A BR_F BR_F01 1 0 0 1 4 S-3 IND A BR_F BR_F01 1 0 0 1 5 S-3 IND A BR_F BR_F01 1 0 0 1 6 S-3 IND A BR_F BR_F01 0 1 0 0.5 7 S-3 IND A BR_F BR_F02 0 0 1 0 8 S-3 IND A BR_F BR_F02 0 1 0 0.5 9 S-3 IND A BR_F BR_F02 1 0 0 1 10 S-3 IND A BR_F BR_F02 1 0 0 1 11 S-3 IND A BR_F BR_F02 0 1 0 0.5 12 S-3 IND A BR_F BR_F02 1 0 0 1 I've created a new DF that contains the info I'm interested in: >DF2 = cbind(DF[1],DF[5],DF[9]) >DF2 ID Ind frq 1 S-3 BR_F01 1 2 S-3 BR_F01 1 ... ... ... 11 S-3 BR_F02 0.5 12 S-3 BR_F02 1 I am wondering is there a method that I can call to calculate the frequency of A or frq for all individuals with the same Ind code so the DF (matrix) looks something like the following? (I've saw something in a tut based on t-tests that I thought would work, but no joy...) >NewDF ID Ind frq 1 S-3 BR_F01 0.9167 2 S-3 BR_F02 0.6667 Further, is there to then transform the matrix to look something like the following? >FinalDF Ind S-3 S-4 S-5.... S-1000000 BR_F01 0.9167 0.5 1 0.6667 BR_F02 0.6667 0.2 1 0.5 ... ... ... BR_Z98 0.5 1 0.3 1 BR_Z99 1 0.6 1 0.5 Thanks in advance for any help you can offer, and please let me know if there is any further information I can provide. Sean > sessionInfo() R version 2.6.0 (2007-10-03) i386-apple-darwin8.10.1 locale: en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8 attached base packages: [1] stats graphics grDevices utils datasets methods base ______________________________________________ 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.