In this tutorial, we will learn how to add row numbers with in each group of a dataframe in R. We will use combination of group_by() and row_number() functions from dplyr to add row number by group. To get started let us load tidyverse and palmer penguin datasets. Here we … [Read more...] about How to add row number within each group in dplyr
How To find levels of a factor in R
Factors are a type of variable that R uses to store categorical information in R. For example, we can save sexes as factor variable with two values male and female. In this post we will learn about using factor variables in R and learn how to find out about levels of a factor … [Read more...] about How To find levels of a factor in R
How to select one or more columns from a dataframe
In this tutorial we will learn how to select one or more columns/variables from a data frame in R. We first learn how to select the columns of interest with dplyr's select() function by using their name and then we will learn how to select columns using base R approach. Let … [Read more...] about How to select one or more columns from a dataframe
How to rename one or more columns of a dataframe
In this tutorial, we will learn how to rename one or more columns of a dataframe in R. We will use rename() function in dplyr R package to change the name of a single column first and then see an example of using rename() function to rename more than one columns. Let us get … [Read more...] about How to rename one or more columns of a dataframe
How to select only numeric columns in a dataframe
In this tutorial, we will learn how to select the columns that are numeric from a dataframe containing columns of different datatype. We will use dplyr's select() function in combination with where() and is.numeric() functions to select the numeric columns. Let us first load … [Read more...] about How to select only numeric columns in a dataframe