Audience measurement : Problems?

By conducting this research, trying to understand these devices, I detected dysfunctions and abnormalities which surprised me. I had to pinch myself several times to admit it, but when the market advertising space is one of the very first markets in the world economy, I discovered that it established important trading erroneous database, and inadequate or approximate and using methods that would have surely smile brokers and traders in the fifties. I present them in this blog a little loose and I'll update and order based on feedback and information that potential readers are kindly requested to send me.