In this tutorial, we will learn how to collapse multiple rows from a column to a single row based on another column/group. Let us get started by loading tidyverse and checking the tidyr package version. To illustrate collapsing multiple rows into single one, let us create a toy dataframe with continents and countries. Our aim… Continue reading How to collapse multiple rows based on a column
Category: dplyr group_by()
How to sum a column by group in R
In this tutorial, we will learn how to compute the sum of a column by groups in another column in a dataframe. Basic, idea is to group the dataframe by the grouping variable/column and then find the sum for each group. Let us get started by loading tidyverse suite of R packages. We will be… Continue reading How to sum a column by group in R