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total_daily_volume
2008 Oct 01
5
"group by" functionality in R
...the following information
day hour volume
1 2003-07-18 10 836700
2 2003-07-18 11 375000
3 2003-07-18 12 60000
4 2003-07-18 8 1020000
5 2003-07-18 9 390000
I have been trying create a new data frame with the following
day total_daily_volume
I can accomplish this by bringing the data to excel and using a pivot
table but I would like to be able to do in R. I have been searching for
several hours but I can not figure out how to sum the the volume of
each day.
Thanks,
Max