Frequency of elements in a list (merging tally data)
10182
Combining values in one column (or part) when values in another column (or part) match
12620
A method to count occurrences in a list
83579
How to find the last occurrence of an item in a Python list
111109
How to sum a numeric list elements
54061
Removing duplicates in lists
11704
Count occurrences of each element in a List[List[T]] in Scala
68650
Get Distinct values out of List
27759
Count how often a particular value appears in an array
22673
Splitting a list into N parts of approximately equal length
88150
grouping on tems in a list in python
71815
Item frequency count in Python
32761
What is the best way to copy a list?
23418
How do I join two lists in Java?
152251
R: How to split list into several numbers and do the calculation?
66761
Is it costly to do array.length or list.count in a loop
28092
Sort a part of a list in place
52869
Find the most common element in a list