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data_mining:pca [2014/08/24 02:02] – phreazer | data_mining:pca [2014/08/24 02:06] – [Parameterwahl (k)] phreazer | ||
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- | \frac{\frac{1}{m} \sum_{i=1}^m || x^{(i)} - x_{\text{approx}}^{(i)} ||^2}{\frac{1}{m} \sum_{i=1}^m || x^{(i)}||^2} | + | \frac{\frac{1}{m} \sum_{i=1}^m || x^{(i)} - x_{\text{approx}}^{(i)} ||^2}{\frac{1}{m} \sum_{i=1}^m || x^{(i)}||^2} |
$$ | $$ | ||
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+ | [U,S,V] mit S als diagonale Matrix. | ||
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+ | Für ein k, kann $1-\frac{\sum_{i=1}^k S_{ii}}{\sum_{i=1}^n S_{ii}} \leq 0.01$. |