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Zhang, Fan
·
Jul 14, 2005
·
r-help
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Calculate of data frame
Zhang, Fan
·
Jul 14, 2005
·
r-help
Thanks for your answer, Peter. Now I have a new data frame which is sorted by (model,date) pair. Since the sorting is done to charactors, I have 7/1/2005 followed by 7/10/2005 instead of 7/2...
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