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- Aggregate / summarize multiple variables per group (e.g. sum, mean)
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- Fastest way to add rows for missing time steps?
- Assign multiple columns using := in data.table, by group
- How to replace NA values in a table for selected columns
- Why is plyr so slow?
- Merge rows in a dataframe where the rows are disjoint and contain NAs
- Replace logical values (TRUE / FALSE) with numeric (1 / 0)
- write.csv for large data.table
- DT[!(x == .)] and DT[x != .] treat NA in x inconsistently
- Merge overlapping ranges into unique groups, in dataframe
- Convert a data frame to a data.table without copy
- What you can do with a data.frame that you can’t with a data.table?
- Counting unique / distinct values by group in a data frame
- cbind a dataframe with an empty dataframe – cbind.fill?
- Convert data.frame column format from character to factor
- How to convert a table to a data frame
- Changing Column Names in a List of Data Frames in R
- dplyr filter with condition on multiple columns
- How to sort a data frame in R
- dplyr – filter by group size
- Create dataframe from a matrix
- Merge dataframes of different sizes
- Populating a data frame in R in a loop
- Split Data Frame into Rows of Fixed Size
- Reason behind speed of fread in data.table package in R
- How to append a whole dataframe to a CSV in R
- Shifting a column down by one
- Identifying where value changes in R data.frame column
- Removing multiple columns from R data.table with parameter for columns to remove