How to Create Directory and File If It doesn’t Exist in R

Check and Create If a Directory and File Exists in R

When working with file systems, checking the directory or file existence is always better before commencing the operations. For a directory To create a directory, if it does not exist, use the dir.exists() function. After checking its existence, if it does not exist, you can use the dir.create() function to create a new directory with a specified … Read more

How to Summarise Multiple Columns using dplyr in R

Summarise Multiple Columns By Group in R

When we say summarise multiple columns, it means aggregate the input data by applying summary functions (sum, mean, max, etc.) to multiple numeric columns simultaneously. The below image describes visually: If grouping is required, you can group by a specific categorical column and get the statistics for each group. The dplyr package provides the summarise() … Read more

How to Count Unique Values by Group in R

Counting unique observations by single or multiple groups in R

What do you mean by counting unique values by group? Well, it means you divide the dataset into subsets based on the values of one or more categorical variables (columns), and within each subset, you determine the number of distinct (unique) values in a specific column. Here are three ways to count unique values by group: … Read more