                     y                 Slide Block ID
  441068 -0.020464103 1 15 AAAAGFASKTPANQA
  448844 0.061400545 1 41 AAAAGFASKTPANQA
  456620 -0.031026896 10 15 AAAAGFASKTPANQA
  464396 -0.033166864 10 41 AAAAGFASKTPANQA
  472172 -0.108148804 11 15 AAAAGFASKTPANQA
  479948 -0.397759508 11 41 AAAAGFASKTPANQA
  4167 -0.67283526 1 13 AAAAALPAFSPPAQA
  11943 -0.23982701 1 37 AAAAALPAFSPPAQA
  19719 -0.10169540 10 13 AAAAALPAFSPPAQA
  27495 0.70043972 10 37 AAAAALPAFSPPAQA
  35271 -0.18807235 11 13 AAAAALPAFSPPAQA
  43047 -0.17982104 11 37 AAAAALPAFSPPAQA
  5264 -0.011681805 1 17 AAAAATQAAGAGAVA
  13040 -0.073063462 1 41 AAAAATQAAGAGAVA
  20816 -0.017996429 10 17 AAAAATQAAGAGAVA
  28592 0.010159866 10 41 AAAAATQAAGAGAVA
  36368 -0.056034035 11 17 AAAAATQAAGAGAVA
  44144 -0.346175641 11 41 AAAAATQAAGAGAVA
  5612 -0.7121977 1 18 AAAAGFASKTPANQA
  13388 -0.4076580 1 42 AAAAGFASKTPANQA
  21164 -0.1864131 10 18 AAAAGFASKTPANQA
  28940 -0.1140163 10 42 AAAAGFASKTPANQA
  36716 -0.3246222 11 18 AAAAGFASKTPANQA
  44492 -0.4355016 11 42 AAAAGFASKTPANQA
   
  where there are 4 different IDs and each ID appears twice in two blocks for each of 3 slides. I want to extract the data
  in such a way that every ID that appears the first time will be grouped to group 1, and the second time to group 2.
  For the data above, it means that the IDs with response y that are in blocks 15,13,17,18 for each slide will be in group 1 and the rest are in group 2. How can I do this in R ?
  Thanks for your help,
  Jenny

 		
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