Google quietly announced on Twitter they have added the ability to compare data across multiple factors within charts and graphs. Google Ads Report Editor which launched in 2015 added the ability to compare date ranges a year ago, but now you can plot those comparisons in a chart and graph.
Google said "Report Editor users often tell us how important it is to be able to chart performance for two different time periods. That's why we’re happy to announce that Report Editor charts now support time comparison." This allows you to better visualize your performance, such as how this week's clicks compare to last week's. You'll be able to visualize week over week, month over month or other date range comparison charts in your customized reports in the Report Editor.
Here is a screen shot:
Give it a try - it is an awesome way to visualize data.
Forum discussion at Twitter.