Apply subtotals back across a dataframe
7274
Calculate group mean (or other summary stats) and assign to original data
8238
How to apply ReplaceAll to denominator?
133760
How do I create a sum for each group of data in Libre Office Calc?
139237
How to sum over duplicates?
138655
Use the script to export values with offset by one column
151672
Summing values if same second column value
11591
Manipulate results to display rows as columns
26452
Summing data from column in the Attribute table
17863
How to sum over a List
7714
Transpose rows and columns with no aggregate
7756
LaTeX adjusting \sum limits
12350
How do you put conditions on indices in a sum?
122392
Apply function conditionally
111109
How to sum a numeric list elements
79298
Recalculate a Field with data from another field, ignoring NULL values
110612
Conditional summing (R)
73700
How do I transpose data in columns to rows?