I wish to sort the companies on a variable, say A, in ascending year. Then, I wish to divide them into three categories of equal number such that category 1 has the lowest values and category 3 has the highest values. Now, I would again repeat the task with another variable, say B and accordingly three categories will be made, say 4, 5 and 6. Now, I want to extract common companies from category 1 and 4; 1 and 5; 1 and 6; 2 and 4; 2 and 5; 2 and 6; 3 and 4; 3 and 5; 3 and 6. This entire process will be followed every year. If anyone can help me please. I am in dire need of help.
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