Rules of Thumb, Shortcuts, Loose Ends, and Other Off-Topic Topics:
Unless you can prove your approximation is as good as my exact solution, I am not interested in your approximation. R. Daryl Bock
Unless you can show me your exact solution is better than my approximation, I am not interested in your exact solution. Benjamin D. Wright
Rule of Thumb Estimates for Rasch Standard Errors
The asymptotic standard error for Marginal Maximum Likelihood estimates of the Rasch difficulty d or ability b parameters is:
Continue: Rules of Thumb, Short Cuts, Loose Ends
 I first applied to the University of Chicago because Prof. Bock was there.
 There was a reason I ended up working with Prof. Wright.