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Vadim Kosoy edited The_following_theorem_is_the__.tex
about 8 years ago
Commit id: d6740ef9de351ea2ddc7037ed0b8ce43a6fe7595
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\begin{theorem}
\label{thm:ort}
Fix $\Gamma=(\Gamma_{\mathfrak{R}}$, $\Gamma_{\mathfrak{A}})$ a pair of growth spaces of rank 2 and $\mathcal{E}$ an error space of rank 2. Assume there is $\zeta: \Nats^2 \rightarrow \Reals^{>0}$ s.t. $\zeta \in \mathcal{E}$ and
$\Ceil{\log $\Floor{\log \max(-\log \zeta,
1)} 2)} \in \Gamma_{\mathfrak{A}}$\footnote{If $\log(k+1), \log(j+1) \in \Gamma_{\mathfrak{A}}$ then this condition holds for any $\mathcal{E}$ since we can take $\zeta = 2^{-h}$ for $h$ polynomial.}. Consider $(\mu,f)$ a distributional estimation problem and $P$ an $\mathcal{E}(\Gamma)$-optimal predictor for $(\mu,f)$. Then, $P$ is also an $\mathcal{E}^{\frac{1}{2}\sharp}(\Gamma)$-optimal predictor for $(\mu,f)$.
\end{theorem}