Determine visitors per day(traffic) without analytics software?
It is desirable to accurately predict website traffic without installing Google analytics or other analytics code on the site. This is particularly useful in predicting average visitors per day of the site you do not own.
The good thing is that : http://www.statbrain.com/ allows you to estimate average visitors per day to the site without the need of analytics code or software. The bad thing is that it is grossly inaccurate. See correlation graph below between real Google analytics visitors per day and Statbrain visitors per day.

According to this plot, Statbrain tends to overestimate visitors per day than Google analytics. So if we like to accurately predict visitors per day of any website on the internet, we will just use this correction equation:
y = 0.244x + 126.7
where x is the Statbrain Visits per day data and Y is the predicted actual visits per day (closest estimate if someone will use Google analytics to track website visitors).
There were other sites on the internet that will help estimate website traffic such as Alexa, but cannot give visits per day data. It can only give reach and traffic ranking which seems not useful if someone needs to predict exact traffic.

