Maybe a dumb question but why?

Im a firm believer that data collected that doesnt have a clear action associated with it is meaningless - and i couldnt think of an action i would take if my traffic goes up or down on my personal blog - but tbh i mainly blog for myself not really to build an audience, so our objectives might differ

Just an FYI, the data collected to make those conclusion was through the server log (Apache2 in my case). So if you run your own server or VPS, you already have this information.