I would really like to be to run this sort of analysis (or use tools/services that perform it for me), regardless of how efficient the current popular methods are. Is anyone familiar with the tools or services available to do so? Thanks in advance!
You can try twitteraudit.com (I made it a few years ago). It doesn't do anything fancy at all, but it works pretty well with about a 10% margin of error. It only looks at a sample of 5000 followers though.