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...s than or equal to the *first* stock in that column + 6. Repeat the following sentence, but instead of *first* use second, third, etc. In short, I do not want an equity that has dates within a week of one another at any point in the data frame/list (depending on if you're looking at alldat or divall). For example, for FCX.UN.Equity, I would only want the row beginning with 2001-07-02 to remain, as well as the row starting with 2010-01-27. I cannot delete rows immediately because I need all rows in order to determine which rows to delete. diveq<-alldat$myeq divall<-split(alldat,diveq)...