R data.table not preserving factor when applying function by group
72860
data.table and table unexpected behavior
50752
Linear Regression and group by in R
83399
Using data.table package inside my own package
19141
How to reorder data.table columns (without copying)
128948
R data.table breaks in exported functions
132210
How to assign a counter to a specific subset of a data.frame which is defined by a factor combination?
156949
ddply + summarise function column name input
41944
R Time Series Issues
157122
How can factor-levels be automatically chosen in R to maximize the number of positive coefficients in a regression model?
127494
Using ifelse with transform in ddply
16387
DT[!(x == .)] and DT[x != .] treat NA in x inconsistently
149518
Adding counts of a factor to a dataframe
121414
Aggregate data in R
81170
How to replace NA with mean by group / subset?
42781
Dynamic column names in data.table
5292
Convert data.table to data.frame (i.e. undo setDT)
70801
data.table::fread doesn't like missing values in first column