replace id by running number
try this: y <- c(4,4,4,2,45,12,12) match(y, unique(y)) I hope it helps. Best, Dimitris
On 3/27/2010 4:42 PM, sun wrote:
Dear all, I want to replace an (unsorted) id variable in a large dataset by a running number without changing the order of the cases. E.g., y<- c(4,4,4,2,45,12,12) should be replaced by something like x<- c(1,1,1,2,3,4,4) Sorry for this simple question& thank you very much for your help! [[alternative HTML version deleted]]
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Dimitris Rizopoulos Assistant Professor Department of Biostatistics Erasmus University Medical Center Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands Tel: +31/(0)10/7043478 Fax: +31/(0)10/7043014