In previous posts, you have already learned how to make a frequency table or a contingency table for categorical variables. Although a table can be very insightful, things usually only get tangible when they are visualized. In this post, we learn how to turn a frequency/contingency table into a barplot with R.
Once you have imported your dataset into R, there are countless possibilities for analyzing the data in a quantitative way, as opposed to the qualitative analysis that went into the annotation. The very first quantitative analysis that you may want to perform on categorical variables is to see how often a certain value occurs with respect to another value in a variable. This might be practical if you want to find out if you have fairly balanced dataset.