Summarize Multiple Columns of data.table by Group in R (Example) | lapply, mean | data.table Package Published 2021-11-05 Download video MP4 360p Similar videos 03:51 Group Data Frame by Multiple Columns in R (Example) | group_by & summarize Variable | dplyr Package 05:37 Group by and Summarise functions in R programming - use the tidyverse package to wrangle your data 13:54 Grouping and Summarizing Data Using dplyr 03:11 Contingency Table Across Multiple Columns in R (Example) | t(), sapply(), tapply() & sum() Functions 06:53 Calculate Mean of Data Frame Column in R (6 Examples) | mean, summarise of dplyr, colMeans & na.rm 11:37 How to Summarize Data in R | Collapse and Group data in R 07:28 Calculate Cumulative Sum by Group in R (4 Examples) | dplyr & data.table | ave & aggregate Functions 03:45 Table by Group in R (Example) | table() Function | Frequency Counts of Elements in the Column "x" 03:06 Sum by Group in R (2 Examples) | Apply aggregate Function to Vector / Column / Variable 04:17 Sort data table by multiple columns in R (4 minutes) 06:30 Aggregate Daily Data to Month & Year Intervals in R | Base R & dplyr Example | lubridate Package 08:01 Summary Statistics of Data Frame in R (4 Examples) | Calculate Descriptive Metrics | Mean, Max & Sum 05:30 Sort Rows of data.table in R (3 Examples) | Order with setorder Function | Single & Multiple Columns 03:49 Mean by Group in R (2 Examples) | dplyr Package vs. Base R | group_by() & summarise_at() Functions 03:09 Select Subset of Data Table Columns in R (Example) | Keep & Remove Variables | data.table Package 06:21 dtplyr: data.table plus dplyr. 04:50 Summary Statistics by Group in R (3 Examples) | Descriptive Stats | tapply, dplyr & purrr Packages 04:21 Remove NA when Summarizing data.table in R (2 Examples) | Delete & Drop Missings | na.rm Argument 04:52 Count Unique Values by Group in R (3 Examples) | Distinct Numbers | dplyr & data.table Package More results