Why doesn't summarize work the same way in dplyr and plyr?
10336
dplyr: "Error in n(): function should not be called directly"
84169
What is the terminology for data aggregated via summed totals versus data aggregated via means?
25459
Leave out a term when summing
150743
Why does the number of rows change during AIC in R? How to ensure that this doesn't happen?
110612
Conditional summing (R)
24783
Sum values with same name
151542
How does one reorder columns in a data frame?
17863
How to sum over a List
9668
Consecutive/Rolling sums in a vector in R
105683
Ordering Merged data frames
2060
How do I create group data in a category with more than and less than in R?
36003
Summarizing multiple columns with data.table
112286
Why does R use partial matching?
139443
Why can't I iterate twice over the same data?
43607
Summarizing column in QGIS field calculator?
29218
I totally don't get the result from the R 'order' example
55747
Grouping functions (tapply, by, aggregate) and the *apply family