I just wonder can we use ggplot to have two labels of names for x axis (vertically)?
Here is what I want:
I want to have one label name, for example "discount", and have breaks and a histogram for "discount", and I also want to have another x-axis below the histogram, and showing label name, "price", and only showing this x axis and the breaks (not another histogram, and the breaks are same as the "discount"). -- Like a histogram with two x-axis with different label names and same breaks.
Is this doable?