R : R (dplyr): count number of "0" observations before "1" in a column by ID
R : R (dplyr): count number of "0" observations before "1" in a column by ID
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R : R (dplyr): count number of "0" observations before "1" in a column by ID
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of "1" (dplyr): count before in "0" R column number by R observations ID : a