Displaying 1 result from an estimated 1 matches for "sum_of_counts".
2009 Aug 26
2
counting subgroup sums within a data frame
...3
8/4/2009 B Y 5
8/5/2009 A X 3
8/5/2009 B X 7
8/5/2009 A Y 2
8/5/2009 B Y 1
I would like to create a data frame of the sum the daily counts for,
say, class 'A', like so:
Date sum_of_counts
8/1/2009 10
8/2/2009 5
8/3/2009 9
8/4/2009 4
8/5/2009 5
I ultimately would like to do sum of counts on all classes and
subclasses. It seems that this is equivalent to a GROUP BY query in
SQL.
I'm sure this is possible in R. Any suggestions?
[[alternati...