I have a dataset like below: StudyID Sereis Hb CO2 S001 1 21 49 S001 2 22 51 S001 3 23 53 S001 4 24 55 S001 5 25 57 S001 6 26 59 S001 7 27 61 S001 8 28 63 S001 9 29 65 S001 10 30 67 S002 1 18 45 S002 2 20 47 S002 3 22 49 S002 4 24 51 S002 5 26 53 S002 6 28 55 I'd like to create a dataset like follow. cutting data from series 1- 4 as 1st sub-dataset, then cutting from series from 3-6 as 2nd sub-dataset, and so on. would you please help? StudyID Sereis Hb CO2 Subset S001 1 21 49 1 S001 2 22 51 1 S001 3 23 53 1 S001 4 24 55 1 S001 3 23 53 2 S001 4 24 55 2 S001 5 25 57 2 S001 6 26 59 2 S001 5 27 61 3 S001 6 28 63 3 S001 7 29 65 3 S001 8 30 67 3 S001 7 31 69 4 S001 8 32 71 4 S001 9 33 73 4 S001 10 34 75 4 S002 1 18 45 1 S002 2 20 47 1 S002 3 22 49 1 S002 4 24 51 1 S002 3 26 53 2 S002 4 28 55 2 S002 5 30 57 2 S002 6 32 59 2
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