Oscar_Cunningham comments on Harry Potter and the Methods of Rationality discussion thread, part 9 - Less Wrong

10 Post author: Oscar_Cunningham 09 September 2011 01:29PM

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Comment author: PhilGoetz 25 September 2011 03:55:47PM *  4 points [-]

BTW, we're told in canon there are other schools for wizards and witches, but everyone famous seems to have gone to Hogwarts. Why? There isn't even an entrance exam, and most of the teachers are incompetent; so it can't be either their selectiveness or the quality of their education.

How can we estimate the number of witches and wizards in the world from canon? And, also, the number of students at Hogwarts?

Comment author: Oscar_Cunningham 25 September 2011 05:30:30PM 6 points [-]

How can we estimate the number of witches and wizards in the world from canon? And, also, the number of students at Hogwarts?

J. K. Rowling was never too bothered with the numbers (by her own admission). In particular the total number of students in Hogwarts is portrayed as much greater than the number of students per year multiplied by seven, and the wizarding world is absurdly small but still far too large to account for the fact that there appears to be only one school in Britain.

Comment author: ArisKatsaris 28 September 2011 09:20:00AM *  2 points [-]

The sadder thing is that Eliezer doesn't seem particularly bothered with numbers either. The "armies" each of the generals have are mentioned to have 24 soldiers each.

24x3=72 students in the first year. This would only make sense if the size of the classes in MoR were about twice as big as in canon. But MoR has never mentioned a single non-canonical first-year student, as far as I can remember, which would imply the opposite, that the sizes of the classes must be about as big as in canon (namely about 40 students in the first year, all houses combined).

EDIT TO ADD: above comment now retracted as factually false, see comments below.

Comment author: Eliezer_Yudkowsky 30 September 2011 12:17:45AM 14 points [-]

The sadder thing is that Eliezer doesn't seem particularly bothered with numbers either.

I beg your pardon. Check Ch. 30 and you should see some non-canonical first-year student cameos in Draco's army. For, may I mention, exactly that reason - I was explicitly familiar with the dilemma of the discordant Rowling statements and decided to resolve in favor of Hogwarts having around a thousand students, so that having around half the students sign up for the armies would give you 72 first-year soldiers.

Comment author: ArisKatsaris 30 September 2011 01:12:27AM 0 points [-]

Ah, nice. I also see some names like "Melvin Coote of Gryffindor" and "Allen Flint" of Slytherin, in the Chaos army.

Apologies for the mistake.