Try this I used today

 

aggregate(data, by=list(factor.name=data$FACTOR.NAME), sum)

 

Norm Good

CMIS/e-Health Research Centre

A joint venture between CSIRO and the Queensland Government

Lvl 20, 300 Adelaide Street BRISBANE QLD 4000
PO Box 10842 Adelaide Street BRISBANE QLD 4000

Ph: 07 3024 1640 Fx: 07 3024 1690 
Em: norm.good@csiro.au  Web: http://e-hrc.net/ 

 


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