How To Change Nominal To Binomial R

R Programming

Hey there, fellow data enthusiasts! Today, I want to share with you a step-by-step guide on how to change a nominal variable to a binomial variable in R. This process has helped me immensely in my data analysis projects, and I’m excited to walk you through it.

Understanding Nominal and Binomial Variables

Before we dive into the technical aspect, let’s quickly review what nominal and binomial variables are. A nominal variable is a categorical variable that has two or more categories with no inherent order. On the other hand, a binomial variable is a special case of a binary categorical variable with only two categories. Understanding the distinction between these two types of variables is crucial for data manipulation and analysis.

Using R to Change Nominal to Binomial

Now, let’s get into the exciting part – using R to change a nominal variable to a binomial variable. We’ll be using the dplyr package for data manipulation, so make sure to have it installed before we begin. If you don’t have it yet, you can install it using the following command:


Once you have the dplyr package, you can load it into your R environment using the command:


Now that we have the necessary package, let’s assume we have a data frame called my_data with a column named color containing nominal values such as “red”, “blue”, and “green”. We want to convert this to a binomial variable where “red” becomes one category and all other colors become the second category.

To achieve this, we can use the following code:

my_data <- my_data %>% mutate(color_binomial = ifelse(color == "red", "red", "other"))

In this code, we are creating a new column called color_binomial based on the condition that if the color is “red”, it will be labeled as “red”, and all other colors will be labeled as “other”. This effectively transforms our nominal variable into a binomial one.

Personal Touch: Why This Technique Matters

I’ve found this technique incredibly useful when working with survey data where participants choose from multiple options. Converting the responses to a binomial format has made my analysis more streamlined and efficient. It’s also a great way to simplify complex categorical data without losing valuable information.


In conclusion, being able to change a nominal variable to a binomial variable is a valuable skill for any data analyst or researcher. With the power of R and the dplyr package, this process becomes not only achievable but also relatively straightforward. I hope this guide has been helpful to you, and I encourage you to explore further applications of this technique in your own data projects. Happy coding!