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I really think viewership demographics affects the ratio of download numbers to (illegal) streaming view counts.
My experience is that the current 15-18 year olds are much more likely to be looking for their anime on streaming sites, while older viewers are more likely to download, so if anything you should construct some function of viewership age to downloaders/streamers ratio. That would then also depend on knowing who is actually watching the series.
In contrast, the ratio of torrent downloads to direct downloads (HTTP, XDCC, FTP) probably depends more on the release group and how they advertise themselves and their releases.
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