Adding counts of a factor to a dataframe
31119
Count number of rows per group and add result to original data frame
58090
Drop unused factor levels in a subsetted data frame
106247
Count number of rows with conditions met in two columns
45771
Add (insert) a column between two columns in a data.frame
128628
shuffling/permutating a DataFrame in pandas
125333
How to iterate over rows in a DataFrame in Pandas
156171
Sort columns of a dataframe by column name
102653
percentage count by group using dplyr
5301
F test and categorical variables
67025
How to convert row values to columns with dynamic columns count?
13177
Numbering rows within groups in a data frame
134066
Total number of factors of a number
100371
Creating a histogram using aggregated data
133825
Reorder levels of a factor without changing order of values
26303
Add a new column between other dataframe columns
45653
Accessing column with df[col] gives: Error 'x' must be atomic for 'sort.list'
24162
How do you "control" for a factor/variable?