The_Wookie
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From my limited understanding, you were always deemed a viewer if you watched a single minute. But official ratings were previously calculated as an average of minutes. Reach is an aggregate of all individuals watching one minute. With the obvious consequence that longer programmes are rating higher.
In search of enlightenment, I fearlessly ploughed into the thicket of Bigfumble. One poster draws a distinction between "standalone average" and "cumulative average". Couldn't make sense of his argument. People sometimes conflate the meaning of "cumulative" with "aggregate".
He seemed to want 4 separate ratings for AFL quarters, 2 separate ratings for NRL halves. Similar to sessions in cricket.
As Ive said before, theres a segment on Bigfooty and at 7 HQ who believe fervently in reach, whereas the rest of the ratings world mostly favours averages still.