Thanks for your quick response. The solution that you propose comes close to what I want, however by using 'FUN = order', the new variable is based on its order rather than y< focal y. In the case of two similar rows (Xrow1=Xrow2 and Yrow1=Yrow2), the value of Zrow1 < Zrow2. Any solutions? Thanks! -- View this message in context: http://r.789695.n4.nabble.com/Count-factor-if-tp3306856p3307164.html Sent from the R help mailing list archive at Nabble.com.
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