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Comparative statics for conditional expectations

Your working appears to me to have a few errors. I will show you how to get as far as the first partial derivative, which should illustrate the general methods to use to allow you to get the second ...
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XGBoost Objective Derivation Problem

Since you mention probabilities, I assume you are thinking about a binary classification, in which case the trees all operate in the log-odds space, the $x$s in your notation. So the $\hat{y}$ and $...
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