How is a daily volume calculated

He didn't ask if it was useful, he asked how it was calculated.

 

I think the Naz practice was to double report volume because a seller sold stock to a dealer and then the dealer sold the stock to a buyer. There wasn't the electronic matching of buys and sells as there is today. So you ended up with two separate transactions and the dealer had the risk of ownership like any other buyer no matter how brief a period of time this was.

 

Well you go to your local library and you look for a book that has it in it you lazy ass.

 

How about addressing the OP's question? Many successfully incorporate volume into reliable strategies, including myself. Just because you have not found one nor understand how to dissect volume, does not mean they do not exist.

WRT to OP, will try and locate a good article I stumbled upon that discussed this topic. It was a WSJ weekend edition from a few years ago if I remember correctly.