Bar charts are good for comparing the sums or counts of categories of data in a dataset. For example, in this recipe, we'll create a chart that compares the weight of chicks being fed one of four diets.
Like most of the recipes in this chapter, this one builds on the previous ones. It will take the foundation from the Setting up to use ClojureScript recipe, along with the infrastructure added in the Creating scatter plots with NVD3 recipe, and build the bar chart on it.
Let's get started.
We'll use the same dependencies and plugins in our project.clj file as we did in the Creating scatter plots with NVD3 recipe. We'll also use the sum-by function from that recipe.
We'll use the chicks' weight dataset that we've seen before. I've transformed it into JSON, and you can download it from http://www.ericrochester.com/clj-data-analysis/data/chick-weight.json. Save it into the resources/data/ directory of your project.