13 Answered Questions

[SOLVED] How to join (merge) data frames (inner, outer, left, right)

9 Answered Questions

[SOLVED] Reshaping data.frame from wide to long format

15 Answered Questions

[SOLVED] How to sum a variable by group

15 Answered Questions

[SOLVED] How to deal with SettingWithCopyWarning in Pandas?

10 Answered Questions

[SOLVED] How to select rows from a DataFrame based on column values?

8 Answered Questions

[SOLVED] How to filter Pandas dataframe using 'in' and 'not in' like in SQL

8 Answered Questions

[SOLVED] How do I make a list of data frames?

8 Answered Questions

[SOLVED] Pandas conditional creation of a series/dataframe column

14 Answered Questions

[SOLVED] How to unnest (explode) a column in a pandas DataFrame?

8 Answered Questions

22 Answered Questions

[SOLVED] How to iterate over rows in a DataFrame in Pandas

8 Answered Questions

[SOLVED] Dynamically select data frame columns using $ and a character value

  • 2013-08-14 02:27:57
  • Samuel Song
  • 113446 View
  • 122 Score
  • 8 Answer
  • Tags:   r dataframe r-faq

19 Answered Questions

[SOLVED] How to sort a dataframe by multiple column(s)

7 Answered Questions

[SOLVED] Pandas group-by and sum

9 Answered Questions

[SOLVED] Simultaneously merge multiple data.frames in a list

4 Answered Questions

12 Answered Questions

7 Answered Questions

15 Answered Questions

[SOLVED] Split data frame string column into multiple columns

7 Answered Questions

[SOLVED] Numbering rows within groups in a data frame

  • 2012-10-16 23:38:41
  • eli-k
  • 97540 View
  • 165 Score
  • 7 Answer
  • Tags:   r dataframe r-faq

15 Answered Questions

[SOLVED] How to select the row with the maximum value in each group

  • 2014-07-03 15:54:11
  • Xinting WANG
  • 85308 View
  • 87 Score
  • 15 Answer
  • Tags:   r dataframe r-faq

11 Answered Questions

[SOLVED] Quickly reading very large tables as dataframes

8 Answered Questions

[SOLVED] Repeat each row of data.frame the number of times specified in a column

20 Answered Questions

[SOLVED] Split (explode) pandas dataframe string entry to separate rows

14 Answered Questions

[SOLVED] Count number of rows within each group

9 Answered Questions

[SOLVED] Change data type of columns in Pandas

4 Answered Questions

[SOLVED] Calculate the mean by group

  • 2012-07-19 14:08:23
  • Jojo Ono
  • 107267 View
  • 59 Score
  • 4 Answer
  • Tags:   r dataframe r-faq

14 Answered Questions

[SOLVED] Drop unused factor levels in a subsetted data frame

16 Answered Questions

[SOLVED] Remove rows with all or some NAs (missing values) in data.frame

8 Answered Questions

[SOLVED] How to select the first row of each group?