How are the conversions are measured for programsa and processors?
 

i know that there are many different ways to measure a conversion ratios, front page raw/unique, second page, form page and so forth

what are the ways that the major sponsors and processors measrue what a hit is?

what does nastydollars, tcg and epoch use?

a team of children from a 3rd world country lined up with a lot tally charts.

http://www.loc.gov/rr/hispanic/1898/img/slaves.jpg

which programs use these children?