Mostly from the three networks. Given that public TV's prime-time audience is a bit older than the average for television overall, it's not surprising that CBS, the demographically oldest network, contributes so much to it. But it's surprising that ABC, cable and independent stations contribute so little. First, a warning. When evaluating audience flow, averages can be deceptive.
Some programs flow a lot better than others.
Information for flow studies comes from data gathered during Nielsen or Arbitron ratings periods. It helps to evaluate audience flow in each market to determine the dynamics at work in a schedule and to examine and plan promotion possibilities. But understanding audience flow can be difficult unless the presentation is understood. These two unique schedules appear on probably public TV's hardest scheduling night. Thus, this program records a 20 percent decline in audience size.