Item Response Theory and LSAT "Equating" Forum

[gatesome]

I found this article to be very interesting: http://www.lsac.org/docs/default-source ... -11-01.pdf

The executive summary reads exactly like a tough RC passage, so free prep. For those without significant statistics training, read the beginning and the end.

Does anyone know if the graph on page 4 applies to actual LSAT questions, and that the "item pseudo-guessing parameter" c, or the chance of guessing an answer correctly, is about 10% instead of the expected 20%?

Supplemental links:
https://en.wikipedia.org/wiki/Item_response_theory
https://www.linkedin.com/in/alexanderweissman (See publications) (linkedin warning, you may wish to remain anonymous)