Könnte mir jemand sagen was beim vorletzten Rechenschritt genau gemacht wird, sodass die Summe beim letzten Rechenschritt verschwindet? Hat es womöglich etwas mit der Produktregel zu tun?
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\( \begin{array}{l} =\underbrace{\int \ldots \int}_{n \text {-mal }} \hat{\theta}\left(x_{1} \ldots, x_{n}\right)\left(\sum \limits_{i=1}^{n} \frac{d}{d \theta} \log f\left(x_{i} \mid \theta_{0}\right)\right) \prod \limits_{j=1}^{n} f\left(x_{j} \mid \theta_{0}\right) d x_{1}, \ldots, d x_{n} \\ =\int \ldots \int \hat{\theta}\left(x_{1} \ldots, x_{n}\right)\left(\sum \limits_{i=1}^{n} \frac{\frac{d}{d \theta} f\left(x_{i} \mid \theta_{0}\right)}{f\left(x_{i} \mid \theta_{0}\right)}\right) \prod \limits_{j=1}^{n} f\left(x_{j} \mid \theta_{0}\right) d x_{1}, \ldots, d x_{n} \\ =\int \ldots \int \hat{\theta}\left(x_{1} \ldots, x_{n}\right)\left(\sum \limits_{i=1}^{n} \frac{d}{d \theta} f\left(x_{i} \mid \theta_{0}\right)\right) \prod \limits_{j=1, i \neq i}^{n} f\left(x_{j} \mid \theta_{0}\right) d x_{1}, \ldots, d x_{n} \\ =\left.\int \ldots \int \hat{\theta}\left(x_{1} \ldots, x_{n}\right) \frac{d}{d \theta}\right|_{\theta=\theta_{0}} \prod \limits_{j=1}^{n} f\left(x_{j} \mid \theta_{0}\right) d x_{1}, \ldots, d x_{n} \end{array} \)
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\( \begin{array}{l} =\underbrace{\int \ldots \int}_{n \text {-mal }} \hat{\theta}\left(x_{1} \ldots, x_{n}\right)\left(\sum \limits_{i=1}^{n} \frac{d}{d \theta} \log f\left(x_{i} \mid \theta_{0}\right)\right) \prod \limits_{j=1}^{n} f\left(x_{j} \mid \theta_{0}\right) d x_{1}, \ldots, d x_{n} \\ =\int \ldots \int \hat{\theta}\left(x_{1} \ldots, x_{n}\right)\left(\sum \limits_{i=1}^{n} \frac{\frac{d}{d \theta} f\left(x_{i} \mid \theta_{0}\right)}{f\left(x_{i} \mid \theta_{0}\right)}\right) \prod \limits_{j=1}^{n} f\left(x_{j} \mid \theta_{0}\right) d x_{1}, \ldots, d x_{n} \\ =\int \ldots \int \hat{\theta}\left(x_{1} \ldots, x_{n}\right)\left(\sum \limits_{i=1}^{n} \frac{d}{d \theta} f\left(x_{i} \mid \theta_{0}\right)\right) \prod \limits_{j=1, i \neq i}^{n} f\left(x_{j} \mid \theta_{0}\right) d x_{1}, \ldots, d x_{n} \\ =\left.\int \ldots \int \hat{\theta}\left(x_{1} \ldots, x_{n}\right) \frac{d}{d \theta}\right|_{\theta=\theta_{0}} \prod \limits_{j=1}^{n} f\left(x_{j} \mid \theta_{0}\right) d x_{1}, \ldots, d x_{n} \end{array} \)