Hello, I have a data frame of the following form
block trial dv 1 1 10 1 1 11 1 1 9 1 2 12 1 2 9 1 3 12 1 3 13 1 3 14 1 3 15 1 4 12 1 4 11 1 4 10 1 4 9 1 4 11 and need to number the rows consecutively in the following manner block trial dv sequ 1 1 10 1 1 1 11 2 1 1 9 3 1 2 12 1 1 2 9 2 1 3 12 1 1 3 13 2 1 3 14 3 1 3 15 4 1 4 12 1 1 4 11 2 1 4 10 3 1 4 9 4 1 4 11 5 Any idea how to solve this problem? I tried but did not succeed :-( Best Jens Bölte
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