Sum of Two or Multiple Data Frame Columns in R (2 Examples) | Addition of Variables | rowSums Subset

Count Non-NA Values in R (2 Examples) | Vector & Data Frame Columns / Rows | sum & is.na Functions

Contingency Table Across Multiple Columns in R (Example) | t(), sapply(), tapply() & sum() Functions

Get Sum of Data Frame Column Values in R (2 Examples) | Calculate Variable Sums | sum() & colSums()

R : How to sum two rows by a simple condition in a data frame

Get the Sum of Each Row in R

R: sum columns/rows in data frames | dplyr || 10

How to calculate sum of rows in R dataframes (Data Analysis Basics in R #12)

Count Non-Zero Values in Vector & Data Frame Columns in R (2 Examples) | sum() & colSums() Functions

Sum Duplicate Rows (Example) | Consolidate & Merge Repeated Values | aggregate & group_by of dplyr

Find Common Rows Between Two Data Frames in R | Identify Duplicates | intersect & inner_join [dplyr]

Count NA Values in R (2 Examples) | Determine Amount in Vector & Data Column | is.na, sum & colSums

Apply Unique Function to Multiple Columns of Data Frame in R | Using unique & duplicated Functions

How to Set Column Names within the aggregate Function in R (2 Examples) | setNames & list Functions

R Sums of Rows & Columns in Data Frame or Matrix (Examples) | rowSums & colSums Functions in RStudio

Add New Variable to Data Frame Based On Other Columns in R (2 Examples) | $ Operator | transform()

Step 28_1 : Get the sum of rows in a data frame

Merge Data Frames by Two ID Columns in R (2 Examples) | merge() vs. join() Function of dplyr Package

Insert New Column Between Two Data Frame Variables in R (2 Examples) | add_column Function of tibble

Convert Data Frame Columns to List Elements in R (2 Examples) | Adapt One / Each Variable | colnames