Hi folks, How do I obtain column b? a b 3 1 65 2 2 3 1 4 4 5 . . 5 1 . . 6 1 2 2 1 3 2 4 . . 1 1 . . 2 1 5 2 . . 9 1 63 2 2 3 . . . . 1 1 2 2 23 3 6 4 9 5 5 6 2 7 1 8 Basically I would like b to restart counting every time it sees a missing value. My apologies if this technique is too simple for some of you. Thanks in advance. Cheers
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