Here is a recent (February 18) comment he made on the Mormon Heretic Blog site.
Bruce Schaalje wrote:A few random thoughts:
1. Criddle commented that “Schalje relies on a statistical tool to assign posterior probabilities for his Bayesian probabilities, then discounts to zero all of the historical evidence.” This is an odd statement, and it’s also completely backwards. A turned-around version of this statement is our main problem with the Criddle study, and is the very reason we developed the open-set extension.
By using closed set methods with only the S/R suspects as candidate authors, Criddle discounted to zero all authorship possibilities other than his S/R candidates. The open-set method — with nonzero prior probabilities for all candidate authors — by contrast, does not discount anyone or anything (including Criddle’s controversial historical evidence). In the paper, we formally assigned equal prior authorship probabilities to all of the candidate authors, including Spalding and Rigdon. For fun, I just reran the open-set NSC attributions with prior probabilities set as follows: early Rigdon .4, late Rigdon .1, Spalding .2, Cowdery .14, Smith .13, Pratt .01, Isaiah .01, someone else .01. The final attributions were almost identical to the equal prior situation. This is because the data so strongly contradicts the S/R prior.
Criddle’s closed set method is equivalent to open-set NSC with equal nonzero priors for his S/R candidates, but priors forced to zero for everyone else. Criddle and Jockers are right about their own study: if you force the S/R theory to be true (by using closed set NSC model), NSC classification will generate results consistent with the S/R theory. But the crippling circularity of this reasoning renders their results inconsequential (alliteration inspired by Neal A. Maxwell).
2. Criddle said: “there are serious problems with the method promoted by Schaalje et al. I can’t go into that now, but will likely do so when my work situation becomes more manageable.” This smacks of false bravado. I will wait with interest for his detailed comments on this topic, especially since the open-set method is simply a generalization of the closed-set NSC method used by Criddle himself. But seriously, if there is something wrong with our generalization that is obvious to Criddle, I would like to know. (It’s certainly possible that we have missed something. Academic discussions about these kinds of things are what the professional literature is all about.)
3. Criddle and Jockers keep saying that our argument was a straw man argument. I just don’t see it. We provided literature citations for the importance of allowing the candidate set to be open, we extended the Criddle method to allow an open set, we pointed out empirical problems with ignoring text size (a point that Criddle and Jockers admitted being worried about), and we constructed an artificial attribution example to demonstrate that nothing is lost but much is gained from properly allowing the candidate set to be open. The point of the artificial Hamilton-Rigdon example was only that absurd results could be avoided using the open-set technology. We included all of the Criddle candidate authors in our study with nonzero prior probabilities, and we used exactly the same marker words. I think that the cry of ‘straw man’ is too often used in place of well-considered counter-arguments.
4. Bishop Rick (by the way, our first counselor in a bishopric a few years ago was named Rick, and because the Bishop was gone so often, was referred to by most of the ward members as Bishop Rick): It seems to me as well that “Criddle was trying to prove the Book of Mormon was written by S/R . . . despite his claims.” We were trying to bring some sanity to the situation. We didn’t prove that the S/R theory is false – we simply argued that Criddle’s methods were flawed, so his results are meaningless. In doing so, we found that the NSC method could be made more useful and powerful in authorship attribution problems. We admitted in the Conclusion Section that more work is needed; this is not the final stylometric word in Book of Mormon research.
I found the entire project a fascinating application of statistical methods, independent of the Book of Mormon connection. So for me, the project was anything but a waste of time. Jockers has moved on to comparisons of other machine-learning tools for authorship attribution, so I don’t think he sees this project as a waste of time either.
5. We made a small effort at dealing with the archaic language issue. As mentioned in the paper, in one of our analyses we dropped “and it came to pass that” from the Book of Mormon chapters (we actually pretended that it was one word, effectively dropping it from the texts). The classification results were almost identical. But clearly, more needs to be done.
6. Keller: Thanks for your initial help on the project. As I remember, you pointed out the Koppel paper, a great and timely review of the authorship attribution literature.
The work of Wrencher, Larsen, and Layton identified twenty-four different author styles in the Book of Mormon, none of which came from nineteenth century authors.
The Berkeley Group Study also concluded that none of the Book of Mormon came from nineteenth century authors.
Bruce Schaalje's NSC extensions also provide the same conclusions. The S/R theorists need to deal with this.
Glenn