How Accurate Is Alexa For Traffic Measurement?

I found something which is very query to me. I've noticed that a blog with 3000-5000 unique visitors per day, its Alexa rank is between 100k to 200k. While a blog with 100-300 unique visitors per day, its Alexa rank below 50k..How come huh?? Can anyone tell me why?? I'm wondering why act.

From here, we can see that the Alexa for traffic measurement is inaccuracy. So yesterday i were thinking about this matter and trying to get the answer. Before i got the answer, actually I'm doing an experiment since yesterday. The experiment may take 1-2 weeks time to see the result.

Actually my experiment is not trying to gain more traffic to a blog, but trying to improve Alexa rank without increase the blog traffic. Maybe just 100-300 unique visitors per day, but can get below 50k.

This is tough. The experiment maybe fail or maybe success. But i hope i can success. Please don't ask me what's my experiment.

I can tell you that, after i googled for few hours, but i didn't find any web page / blog is sharing this tips.

Good luck to me! :D

Alexa Web Discovery Machine