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Originally Posted by HomeInMyShoes
That's a faulty deduction Issybird.
Just because a month is not Classics and not PCML does not mean a Public Domain book would not be chosen. The numbers from the book club suggest at least one of the months would have been PD or at least a Classic (> 70 years old.)
Taking out Classics and PCML from 75 months of data, Public Domain was 16 of 66 months and Classic was 24 of 66 months. That will inevitably rise to 17/67 an 25/67 after this month. The book club has never needed extra help in choosing old books. The numbers tell us this.
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Take them out or leave them in, just don't double-count. The numbers don't suggest anything except that in the former Classics and PCML months that PD would have shown up in the same proportion as other months.
Moreover, the membership in the book club has changed enormously over time as have options for getting books, and I'd argue that recent data have more predictive power than that of years ago.