[R] weighted mean by week

David Freedman dxf1 at cdc.gov
Wed Jul 18 04:49:46 CEST 2012

Honestly, I wasn't sure what you wanted to do with 'group'.  Here it is with
the 'group' variable deleted

dt[,lapply(.SD, function(x)weighted.mean(x,myweight)), keyby='myweek'] 

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