Return df with a columns values that occur more than once
39134
Subset data frame based on number of rows per group
138925
How to convert multiple duplicate columns as single row with appreciated values
75610
How to select a value from a list with non-uniform probabilities?
158926
How do I find out whenever a value changes in a certain column?
136871
R use ddply or aggregate
112077
How to check if a value already exists to avoid duplicates?
136923
Get the row(s) which have the max value in groups using groupby
53689
Filtering out duplicated/non-unique rows in data.table
31844
How to call a function that returns multiple rows and columns in a data.table?
152949
Reshape multiple value columns to wide format
19952
Counting DISTINCT over multiple columns
28559
How to sort a dataframe by multiple column(s)
4897
Best way to return multiple values from a function?
139443
Why can't I iterate twice over the same data?
31013
How to select records with maximum values in two columns?
2082
Excel Large Function with Duplicates
157682
How do I operate on a DataFrame with a Series for every column