I'm starting gwas analysis and, actually I have quite a hard time on some points.The analysis were conduted by Affymetrix array and I have a case-control study. I have the .bed, .fam. bin, .ped, and .map files. However the files do not state which are the individuals cases and controls and also the sex is not included. I also need to remove some samples from the analysis.How can I edit these files, and which ones should I edit (ped and fam?) I've tried excel and I can not because the file is too large. The other question how can I change the Affymetrix codes to the rs name? Can the bed file be read in any way? Sorry if my questions are very basic, but really I'm a beginner in this area. Thank you!