>>48300229-- To measure the "base audience" that is when the streamer does super-debuff content, such as superchat readings.
-- To measure the "company audience" you can look at the box-total for the company during peak streaming hours. Obviously each girl will only get a percentage of that, and it's dependent on overlaps. You probably have to subtract the "base audiences" too.
-- To get the content-audience, measure how the streamer's numbers are different from a normal zatsu stream.
-- The numbers audience is an unpredictable multiplier-effect that mostly shows up during special streams, like Koshien or Holofes