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 … [Read more...] about How to collapse multiple rows based on a column
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 … [Read more...] about How to sum a column by group in R