Cumulative count of each value
13177
Numbering rows within groups in a data frame
69570
How to count number of distinct values in a range?
5136
How to sum a variable by group
124701
Correlation between continuous data and count data
48134
Nested loops into mathematical model to count number of operations
100371
Creating a histogram using aggregated data
149518
Adding counts of a factor to a dataframe
84927
Get names of column with max value for each row
16381
Include levels of zero count in result of table()
21701
Histograms with pre-counted data
60555
How to count occurrences of a column value efficiently in SQL?
129336
sum all values for table column based on class
80282
count(*) vs count(column-name) - which is more correct?
32259
How to find the cumulative sum of numbers in a list?
116266
Most Efficient way to calculate Frequency of values in a Python list?
66894
How can I count the occurrences of a list item?
3455
unique combinations of values in selected columns in pandas data frame and count