Overlay plot including both grouped and ungrouped column data
I have a column of continuous y-data that I want to graph against an x-axis (time, in this case). There is also a grouping column that distinguishes the y-data into several groups.I want an easy way to automate production of a series of graphs, each of which shows the results for a single group overlayed on the results of the aggregate (ungrouped) data. So, let's say there are 10 groups. I'd like ...