How to subset ID's that contain different factor values
93921
Select groups based on number of unique / distinct values
63833
How to identify cells in Column A that contain any of the values in Column B
146977
Subset of a data frame with the penultimate values of one of the columns
89041
Identify records in data frame A not contained in data frame B
146118
Grouping predictor factor levels based on response variable
53689
Filtering out duplicated/non-unique rows in data.table
89611
Combinations of selecting $n$ objects with $k$ different types
66211
Removing elements that have consecutive duplicates
25405
Why does my calculated column not pick up the correct ID
44004
Quick question about subsetting via character-class
158860
Subsetting matrices
132210
How to assign a counter to a specific subset of a data.frame which is defined by a factor combination?
123904
How to compare different values in sql server
36815
SQL: how to select a single id ("row") that meets multiple criteria from a single column
112282
Remove duplicate fields in a given column (after ID check)
128980
How to deal with factors with rare levels in cross-validation?
32937
Combine two data frames by rows (rbind) when they have different sets of columns