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    MLE and Gamma Distribution for econometrics class

    Here's an upload of the question, we haven't really covered this material in class a) My log-like = -a*n ln (b+xi) - n*ln Γ(a) + n*(a-1) ln yi - (yi/(b+xi)) I can get dl/db, but not dl/da b) I get the solution b=-xi, but that doesn't seem right. I cannot get a solution for a. My...