[R] weighted mean by week
dimitri.liakhovitski at gmail.com
Wed Jul 18 19:07:53 CEST 2012
David, thanks a lot!
I tried x[-1] myself but forgot to delete 'group' from the keyby
statement - this explains why it did not work for me.
This is amazing - just 2 lines instead of my many-many.
On Tue, Jul 17, 2012 at 10:49 PM, David Freedman <dxf1 at cdc.gov> wrote:
> 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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