Optional Homework Exercises, Set #4, for IRT Thetahat class #1:

1. See if you can get a(ny) symbolic math program (like Mathematica) to
take the derivative of a logistic function (call it "P") and get PQ?

2. Can a(ny) symbolic math program (like Mathematica) take the derivative w.r.t. 
theta of the entire loglikelihood from the IRT model?