Greetings R mavens (and that's YOU). Given the following how on earth do I
aggregate and sum duplicate PCT rows into one combined row per PCT?
Data types
> str(xxx)
'data.frame': 9 obs. of 3 variables:
$ Registered: int 1327 2129 10 433 5 166 1784 17 787 700
$ GA_Total : int 127 150 0 32 1 76 153 7 31 23
$ PCT : chr "1120" "1121" "1121" "1122" ...
Data desired to be summarized
Registered GA_Total PCT
1327 127 1120
2129 150 1121
10 0 1121
433 32 1122
5 1 1124
166 76 1125
1784 153 1125
17 7 1125
787 31 1126
Desired summary
Registered GA_Total PCT
1327 127 1120
2139 150 1121
433 32 1122
5 1 1124
1967 236 1125
787 31 1126
When answered this please make the reply suitable as a tutorial for many
other puzzled "R" "aggregate" people. Scarce useful examples on the
web. "Aggregate"
is a basic for statistical programming. Yet even ISBN 978-1461471370 An
Introduction to Statistical Learning with "R" does not appear to delve into
"aggerate". Basic simple and useful fully explained answers. If you have to
use "apply" then explain why.
Thanks
Jim Burke
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